Drafting

 

Surveying Tools on the Desktop Click on any image for a larger view.

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SURVEYORıS OR DRAFTSMANıS PAPER WEIGHT, c. 19th century, measuring 5-5/8" x 3-5/8" x 1-1/2" (14 x 9 x 4 cm), the white stone carved as a rocky field with vines, topped with a multi-fold graduated rule, a right triangle, a rod, a ribbon, and a roll of paper. Unusual, and in fine condition, perfect for the professional's or collector's desk. (10223) $850.

 

By an "Undiscovered" Maker Click on any image for a larger view.

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EIGHTEENTH CENTURY DRAFTING INSTRUMENT FROM THE RHONE-ALPS, BY AN UNRECORDED MAKER, French, signed "Chavant à Nantua, 1783." The 4-7/8" x 6-1/2" (12 x 16.5 cm) brass square has an alignment bar along the short outer edge, and twin shaped ends. One side is divided with a scale of old French measures, a "Demi Pied de Roy," the sixth "inch" subdivided into twelfths (i.e., Lignes). The reverse has a scale of equal parts, labeled "Echelle de Toise" and with transversal interpolation. Condition is good noting a hairline crack and some old denting.

We find no record of the instrument maker Chavant. Nantua is a village about 50 km west of Geneva, with a population of approximately 3000, a size unchanged for at least 250 years. (10253) $950.

 

A Comprehensive Outfit, with Sterling Features Click on any image for a larger view.

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UNUSUAL DRAFTING COMPENDIUM, English, 1904, signed "Negretti & Zambra * London" on the three mathematical rules, on the largest drawing instrument, and in the case, and silver hallmarked on three instruments, and stamped on the case "A.J.D." for the owner. This complete set is contained in the 7" x 5-1/2" x 1-1/4" (18 x 14 x 3 cm) fitted wood case lined in green velvet and green satin, and bound in dark green grain-patterned polished leather. There is an English-pattern ivory sector with its standard multitude of mathematical scales, a rectangular ivory protractor with numerous architects' and surveyors' linear reduction scales on both sides, an ivory parallel rule with twin hinges of nickel silver, three adjustable drawing compasses in nickel silver, a large eraser bound in sterling silver holder, a magnifying glass bound in sterling silver with a fine turned bone handle (both hallmarked for 1904 London sterling), and an opisometer (labeled Rota-Meter) in a sterling silver mount (hallmarked for 1904 Birmingham sterling) with two-handed dial (feet and inches) and extendible lead pencil. Condition is very fine noting edge wear to the case.

This compendium set is quite unusual for its complement of instruments. Perhaps a special order, although to include in a drafting set an opisometer, a lead pencil, a large eraser, and a magnifying glass, all seems eminently sensible. The Negretti and Zambra firm was in business from 1850 until well into the 20th c., manufacturing and selling a very wide range of scientific instruments, with several premises in central London. Their late 19th c. general descriptive catalogue, for example, runs to 577 pages. It offers 23 different forms and sizes of drafting sets, and proposes "Sets of Mathematical Drawing Instruments in Solid Silver made to order." (9259) $3500.

 

An Exceptional Set, probably by Brander Click on any image for a larger view.

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SUPERB SET OF CHARTING RULES, probably German, c. second half 18th century, comprising five linear wood rules each with two brass faces applied on the bevel. Ten different reduction scales are present, numbered 1 to 10, each one beautifully divided and finely subdivided at the end. The rules are 11-7/8" (30 cm) long, in near-new condition contained in the original fitted carrying case lined in beautifully watered paper and bound in leather with splendid gilt stamping of floral designs and birds. Aside from notable wear to the leather, the set is in spectacular condition, complete and all original.

This is a very uncommon outfit, with strong similarities to the craftsmanship of Brander (see G.F. Brander 1713-1783, Wissenschaftliche Instrumente aus seiner Werkstatt, by Brachner et al, 1983). (9239) $4500.

 

"Architect's Foot" Measure in 18th c. Italy Click on any image for a larger view.

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FOLDING "PALMO DI ARCHITTETTO," Italian, 18th century. Constructed as a sector, the brass rule opens to 8-13/16" (22 cm). The circular hinge is engraved with a rosette on each side, and there is a central stabilizing strip. The front is labeled "Palmo di Archittetto," and this "architectıs foot" of 12 short inches is divided and labeled every inch, the terminal inches divided into tenths and quarters respectively. Each inch is approximately 18.6 mm long. Condition is very fine, with traces of silvering, perhaps, and complete with the original wood case bound in dark leather and lined in green chamois.

We find very little reference to the terminology on this rule but, for example, Baldassarre Orsini writes of this scale in his Della Geometrie e Prospettiva in 1771. Most unusual. (9209) $1450.

 

Elegance at the Drawing Table Click on any image for a larger view.

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IMPRESSIVE SILVER DRAFTING SET, English, c. late 18th century, signed "R. Marsh, London." The splendid rectangular case measures 6-3/4" (17 cm) tall constructed of wood covered in fine green rayskin with silver fittings. The set is complete and apparently all original with silver-hinged ivory sector, ivory rectangular protractor / architectıs rule / Gunter's rule, ivory parallel rule with exquisite large silver scissors hinge giving very smooth non-shifting parallel motion, plus instruments in silver and steel: large dividers, auxiliary hinged pencil holder, auxiliary hinged adjustable ink pen, hand-held adjustable ink pen with removable scriber as handle, miniature adjustable ink compass, hand held pencil holder, large dividers with fine adjustment, and combination file / quill knife / screwdriver / tightening tool. In very fine condition, probably lacking a small owner's plaque on the case.

Little is known of the maker of this splendid set, but he/she has a brief entry in Clifton. (9199) $4950.

 

Large Sopisticated Drawing Outfit, with Innovative Devices Click on any image for a larger view.

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EXTRAORDINARY DRAFTING COMPENDIUM, Austrian, c. 1880, signed in various places "Pat. Wissmann & Wallegg" and stamped with logos. The fine fitted mahogany case measures 13-5/8" x 10-1/2" x 1-7/8" (35 x 27 x 5 cm), lined in dark blue velvet and satin, containing 19 sophisticated drafting tools and accessories constructed of brass (both lacquered and plated), steel, ivory, thermoplastic, and wood. There is a fine four-legged proportional dividers designed like a Mordente compass, a parallel-leg inking compass with calibrated thumbwheel adjustments of line thickness and radius, a remarkable double-line ruling pen with adjustments by four thumbwheels, adjustable ruling pen with guide, adjustable ruling pen, small ink compass with three thumbwheel settings, three screw-in tips, extending pencil lead holder, tension adjusting tool, rectangular 1:1000 architect's scale with transversal divisions, and finally an adjustable assembly which supports any one of a total of six 10" (25 cm) long interchangeable rules notched with different spacings or cut with waveform patterns, etc., and clampable over a calibrated 180° range of angles. The latter device has a calibrated advance button and serves, among other applications, as a sophisticated section liner producing various types of spaced parallel lines at selected angles, even variously dotted lines using the offset drawing pens. Overall condition is fine, noting surface rust spotting to the steel, two instruments missing, and the case lid slightly warped.

These sophisticated drawing instruments are the product of Albert Wissmann and Franz Wallegg, in patnership in Vienna, Austria, and Frankfurt, Germany. They are described in various technical engineering journals c. 1880, and covered by patent protection (including 1879 UK patent for "A hatching apparatus"). The large instrument would seem to be a particularly early (and complex) form of section liner. Extremely rare, it does not feature in David Riches' recent comprehensive article on such instruments (Bulletin of the Scientific Instrument Society, No. 120, 28-34). Clearly very few such compendia have survived, noting one in a Bern, Switzerland museum. (9219) $6500.

 

Architect's Pocket Outfit, by "Optician to the Queen" Click on any image for a larger view.

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NAPIER COMPASSES OUTFIT, English, mid-19th century, signed in three places, the case reading "C.W. Dixey, Optician to the Queen, 3 New Bond Street, London." These most compact compasses are finely crafted in nickel silver and steel, with a closed length of 2-3/4" (7 cm), opening on three five-leaf hinges and fitted with twin reversible tips with points, pencil holder, and adjustable ink pen. Included in the outfit is a double-sided ivory rule with several linear reduction scales, plus an ivory container of pencil leads. All is original and in excellent condition, contained in its fitted wood case bound in red Morocco leather and lined in velvet and silk, the case somewhat worn.

This is an excellent example of Napier compasses, exalted by W. F. Stanley (in his Mathematical Drawing and Measuring Instruments of the third quarter 19th century) for their compactness and portability due to the clever design of hollowed out legs and multiple articulations. He describes construction criteria, and ends with "they are a difficult instrument to make perfectly." Here we have an example of their perfection. The maker, Charles Wastell Dixey, worked c. 1838 - 1862, and held a Royal appointment as "Optician and Mathematical Instrument Maker" to Queen Victoria. (9258) $395.

 

Substantial Tracer of Large Arcs -- a rare form Click on any image for a larger view.

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LARGE SPLINE OR CURVE TRACER, English, c. 1900, signed "Clarksonıs Patent, Elliott Bro's, London, No. 105." The 18-3/4" (48 cm) long substantial brass structure has a hinged arm driving a steel pin against the center of a floating steel plate, to give a range of large circular arcs. Motion is finely controlled by thumb screw, with readout on a folding strut calibrated for radii in inches from 25 to 105. Condition is very fine with all original bright lacquer and black enamel finishes.

Designed for tracing or forming large circular arcs, Clarksonıs device is obviously quite rare. We have not found documentation for Clarksonıs invention, but discover that the Marconi Corporation donated two examples (serial numbers 119 and 129) to the Museum of the History of Science in Oxford, in 2003. (9228) $950.

 

A Pleasure to Handle and to Use Click on any image for a larger view.

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ELEGANTLY CARVED PROPORTIONAL DIVIDERS, probably central European, c. 17th / 18th century. Measuring 15-1/2" (39 cm) long, the double-ended dividers are masterfully carved of wood with four inset iron tips and a beautiful iron wing nut. Rectangular slots accommodate the sliding, clampable pivot giving variable ratio positions, calibrated with Roman numerals 2 through 10 and beyond (to 16 apparently). The pivot clamp is made of opposing wood blocks, beautifully carved with geometric designs on all sides. The arms are handsomely shaped, their outer surfaces scratch-engraved with symmetrical swirling designs. Condition is very fine throughout.

In use, these dividers permit a continuum of ratios from enlargement of 2.1 times, down to 1:1 transfers, to reductions of just under 50%. The scales do not give direct linear ratios, but may relate to polygons inscribed in circles, etc. A most elegant instrument with its finely crafted "folk art" quality. (10281) $4950.

 

Attractive Angular/Radial Chart Rule Click on any image for a larger view.

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EARLY LONG-ARM PLOTTING PROTRACTOR, probably German, 17th / 18th century. This finely crafted brass semicircular protractor is 4-1/8" (10.5 cm) wide, with 0-90-0 scale divided every degree and punch-numbered every 10. The crossbar is beautifully shaped and supports a 7-3/4" (20 cm) long rotating arm which is calibrated linearly every unit from 0 to 112 at its shaped far end. The protractor's center is pierced for alignment or fixation, and the instrument has three other fixation holes. Condition is fine noting little traces of gilding. An uncommon early form, with its long plotting arm and elegant shaping. (10291) $1950.

 

Signed Dividers from the South of France Click on any image for a larger view.

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LARGE WROUGHT-IRON DIVIDERS, French, 18th century, boldly signed "IEAN BAPTISTE LASCOVRREIGES" (charmingly engraved with the "N" backwards and the "G" upside down). This finely hand-wrought carpenter's or shipbuilder's dividers are 20-3/4" (53 cm) tall, with fleur-de-lys on both sides of the hinge, and serpentine or floral shapes with pointillated decor on all four sides, near the tapered points. Condition is fine noting general old pitting. Jean Baptiste is a common French name (noting 43,700,000 hits on a recent Google search), but the place Las Courreiges (Las Courrèges today) is little known. But we do find that name used for several roads, and one significant dwelling, all in the south of France near Toulouse. (9216) $1450.

 

A Particularly Early, Diminutive Pantograph Click on any image for a larger view.

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EARLY CONTINENTAL PANTOGRAPH, c. early 18th century. This diminutive drafting instrument is contained in its original finely shaped and fitted wood case bound in dark leather with gilt-stamped decoration to the lid, the interior lined with red chamois leather, the case 10-5/8" (27 cm) long overall. The brass pantograph is substantially built, designed with opposed hinged "V" shapes which join in widely-adjustable integral positions (*, 3, 4, 5, 6, 8) on each of the four arms. The larger "V" has one polished steel foot (which rests at a fixed point established by a hole in the fitting which screws into the wood of a drafting table), a brass foot which slides on the table, and a sharp tracer point to follow a drawing or chart. The smaller "V" rides along, with a pencil holder at its apex, making a reduced or enlarged copy. The brass nuts and thumb pins are all crafted in lovely early decorative shapes. Condition is very fine and complete noting minor stains to the brass and some wear to the case.

Hambly traces the origin of the pantograph to a wood parallelogram design giving a 1:2 reduction, as published by Christoph Scheiner in 1631. Later versions with adjustable intersections gave a choice of alternative reduction ratios. By the mid-18th century the pantograph became very popular in England, especially in brass, and was produced by all the major instrument makers. It was less common in France, although high quality ones with arms of ebony are encountered. Here we have a very rare and probably very early example from the Continent. (10252) $4500.

 

By Thomas Heath, with Ingenious Single-Transversal Readout Click on any image for a larger view.

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SPLENDID PROTRACTOR BY THOMAS HEATH WITH FIVE - ARCMINUTE TRANSVERSAL WINDOW, English, c.1725, signed "T:Heath Fecit." The 8" diameter (20 cm) semicircular brass protractor is hand-divided every degree, with beautiful bold numbering every 10° from 0° to 180° (and from 180° to 360°). The left side is pierced with a window and transversal running from 0° to 1°, itself divided every five arcminutes from 0 to 60. It is further pierced with a central rectangle, and decorated with bold elegant hand engraved "leaves" in the corners. Scales of polygon angles (from 4-sided to 12-sided) are laid out against the degree scales (from 90° down to 30° and up to 150°), and the base of the protractor is finely divided with a scale of four parts per inch, each part subdivided to tenths. Condition is generally fine throughout, noting minor signs of use.

Heath was an exceptional maker, but instruments by him appear infrequently on the market. This one is remarkable in its use of a transversal window, a feature we have seen rarely, once by Edmund Culpeper, and again by Heath (see Millburn's article SIS Bulletin 50, pp. 25-26). In use one measures an angle by placing the protractor's centerpoint on the angle's vertex, placing the crossbar more or less along the baseline (the first side of the angle) rotating the protractor slightly (less than 1°) until the second side exactly cuts an integral number of degrees (or half degrees), and reads the additional minutes where the transversal cuts the baseline. It is a practical, fast technique for reading (or marking) headings, etc. to five arcminutes or better. (7264) $3500.

 

Sumptuously Decorated Architect's Tools Click on any image for a larger view.

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EXTRAORDINARY PART-SET OF DRAWING INSTRUMENTS, probably English, c. 1830, the brass tools with the most sumptuous decoration throughout. There are eleven slots in the case, of which eight are filled, as follows: -- brass and steel dividers body, -- steel tip to complete the above as 3-13/16" (10 cm) tall dividers, -- elegantly shaped brass tip to complete the above as pencil compass, -- hand-held brass pencil holder, -- vertical pen with spring-loaded steel-tipped brass blades for inking; it separates to reveal scriber point on the handle, -- vertical pen with curved steel blades for inking; it separates to reveal scriber point on the handle, -- magnificent little ivory parallel rule with golden scissors hinge bearing extensive floral decor, -- unusual ivory draftsmanıs rule with seven different reduction scales of equal parts, a scale of chords, and on the reverse scales of half- and quarter-inches with transversal interpolation grids. All of the brass surfaces are skillfully hand engraved with floral and geometric designs.

The set is housed in a remarkable portable wooden case 5-1/2" (14 cm) tall, the exterior covered in rectangular and trapezoidal concentric patterns of inlays of different woods, almost as an early "op-art" or "perspective" box, the interior retaining some gilding to the wood. The effect is reminiscent of Tunbridge ware. Condition is very fine, noting one tiny chip to the wood, and the obvious missing pieces to the set. A remarkable set, for which we find no comparable example. (9236) $6500.

 

With Significant Provenance

The First Patented Copying Machine

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JAMES WATT PORTABLE COPYING MACHINE, English, c. 1790, signed on a silver plaque "J. Watt & Co., Patent." The outfit is built into a brass bound mahogany box, 13-1/2" x 11-1/2" x 4-5/8" (34 x 29 x 12 cm) closed, with fine inset brass handles. The box is hinged, the lower section containing: a paper press of twin large ridged brass rollers, a large mahogany and brass crank handle, a green-felt-covered folding fiberboard platen, metal-foil-coated wood panel with two green fabric cushions, a lined wood tray, an oval silver canister, a cubical glass pot, a black cubical pot, and a rectangular tin container with gold painted floral designs on black enamel and interior fitted glass bottle. The upper section has a double-hinged mahogany panel with leather covered surface, plus two original containers of copying powder and the remains of a quill pen. Also included are an original instruction sheet for copying powder, a drying book with remains of a couple of no longer quite readable copies, and a supply of copy papers hallmarked "Prepared Copying Paper, S. Wise & Patch." Condition is fine, the box with some probably later varnish, and noting minor losses and wear: lock missing, couple of wood chips, worming to leather, warping to fold-out wood in lid, ink lids missing, and a crank brass bend.

This is an example of the first duplicating machine, invented by James Watt (the famous inventor of the steam engine), patented in 1780, and manufactured by James Watt and Co. of Birmingham, England. Watt was apparently seeking a way to save time in copying his extensive correspondence, especially that with his partner, Matthew Boulton. In use the original must be written with good ink, then pressed against a moistened sheet of thin unsized paper, and run through the rolling-press to transfer a bit of the original ink onto the copy paper. Watt recommended making a special ink for this purpose, either by dissolving his copying powders in boiling water to which "the addition of a fmall tea-fpoonful of good French brandy...helps to prevent it from moulding," or by preparing, over the course of two months (!), a rather complex aqueous solution of Aleppo galls, green copperas, gum-arabic, and roach-alum. And for the best copies, the thin paper should be first impregnated with again a complex mixture of salts, oyster shells, etc., as spelled out in his patent (see Before Photocopying, Rhodes and Streeter, 1999). Sales of Watt's machine were somewhat limited, partly by fears it would be used for forgeries, but among its many users were George Washington and Thomas Jefferson, and sales continued until such pressing machines were supplanted by carbon paper.

The present machine has descended within a notable family; Paul H. Knowlton (1787 - 1863), a Canadian patriot of Knowlton, Quebec was an early owner. He had been the beneficiary of the large estate of one Sarah Knowlton of Darley Dale, England, and in the 1845 inventory of Sarahıs estate, we find, in her library, "Book Cases, Cabinett & Shells, Copying Machine, Drawings and Minerals, Night Commode, Microscope...." (a photocopy is here included). Sarah's grandfather was Thomas Knowlton (1691 - 1781) the very famous English horticulturist. $14,500.

 

Handmade in Burgundy Click on any image for a larger view.

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HAND CARVED FOLDING SQUARE / LEVEL / RULE, French, late 17th / early 18th c. This wooden "square" has hinged 6-3/8" (16 cm) legs, one pierced and notched for plumb bob and string. The legs are boldly cut with scales of Rhine inches ("Pouces du Rhin"), and of Kings inches ("Pouces de Roy") from 0 to 6 with subdivisions to twelfths, and with two further linear scales running 0 - 70 and 0 - 80 respectively. Condition is good noting slight wobble to the hinge. One leg is engraved "A autun," perhaps a clue to its maker, the city of Autun lying on the Saône-et-Loire in Burgundy. The first wooden example of this instrument we have seen. (7284) $495.

 

Engraved Dividers 38cm Tall Click on any image for a larger view.

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MAJOR EIGHTEENTH CENTURY DIVIDERS, probably French, c. first half 18th century. Measuring a full 15-1/8" (38 cm) tall, they are constructed wth a brass body, eight sided "pommel" head, smoothly-acting five-leaf brass and steel hinge, and tapered steel tips, one removeable. The brass shoulders have delicate shaping, and there is fine decorative geometric engraving on four sides of the pommel, and around the lower end of the hingework. Condition is fine noting light spotting. A major pair of precision dividers, remarkable for their size and beauty. (9276) $2950.

 

Invented by the Renowned Engineer and Surveyor of the Pennsylvania Coal Mines Click on any image for a larger view.

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KIMBER CLEAVER'S MARKING PROTRACTOR, American, boldly signed "Young & Sons, Philada., Pa." This very substantial instrument is made of brass, 6-1/2" x 6-5/8" (16.5 x 17 cm), with distinctive X-form superstructure carrying the 5" diameter divided circle, clamp and long tangent screw. The circle has a silver degree scale divided every half-degree and labeled with directional headings (e.g., SW 210°). The circle is mounted with four knobs for rotation and four spring-loaded marking pins. Rotation is very smooth and sure. There is an external one-arcminute vernier in silver. Condition is very fine, the brass darkening a bit. The instrument is quite handsome with its distinctive design and combination of finishes (clear lacquered and chemically darkened brass, blued steel springs, and silver scales).

We note a smaller example of this rare instrument in Tesseract Catalogue 70 Item 26. Kimber Cleaver (1814 - 1858) started out as a teacher, but quickly rose to become the great mining engineer of the anthracite coal regions of Pennsylvania. He developed various mining inventions, and his innovative protractor, but held no patents, preferring to benefit the common good. Cleaver is credited with the original idea of laying the Atlantic cable. His mother is recorded as a Quaker, but he allied himself with the Native American political party, eventually running for Governor on that ticket. The maker is the famous firm established by William J. Young (born Scotland 1800, died Philadelphia 1870). In 1813 he was apprenticed to Thomas Whitney, and went on to become America's foremost surveying instrument maker of the mid-19th century. The rugged precision construction of this device is quite like that on his examples of Burt's solar compass, and in fact on his production of Burt's solar sextant (see Tesseract Catalogue 43 Item 28). (9261) $2950.

 

Variable Spiral-Forming Drafting Instrument Click on any image for a larger view.

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THE HELICOGRAPH OF PENROSE AND BENNETT, English, c. 1850, signed "W. Elliott & Sons, 56 Strand, London," and "Registıd. Dec. 11, 1850, 2582" and "No. 2." Constructed of lacquered brass, with shafts of brass and steel, this precision spiral-forming drafting instrument measures 14" (35 cm) long overall. The main shaft has fixed at one end an elbow supporting a pin point which establishes the center of rotation of the whole instrument. Near the other end one attaches a carriage with two swiveling ivory wheels. The main assembly, which is free to slide along the shaft, is guided across the paper by a milled wheel set at an angle, which angle can be adjusted precisely against a strongly nonlinear scale, to determine the obliquity of the spiral and consequent rate of motion of the assembly along the shaft. This assembly carries the weighted pen (or pencil) holder, in a carrier whose position is adjustable along a short shaft. The assembly can be moved manually by a swiveling "handle." Condition is very fine throughout, complete with the original mahogany case.

The makers, the partnership of William Elliott (II) with his sons Frederick and Charles, were in business under this name for only three years (1850 - 1853).

The inventors, who registered their design in 1850, were Francis Cranmer Penrose (Architect) and George Forrester Bennett, of Trafalgar Square, London. The instrument is described in W.F. Stanleyıs Mathematical Drawing and Measuring Instruments (pp. 85 - 88 in our 1888 sixth edition), where it is regarded as a considerable improvement over the complex pulley systems of the past. Hambly discusses the present form, and illustrates the pulley form volute compasses made for George III, the pulley system of George Adams, and the 1857 "volutor" of H. Johnson. In all three one used interchangeable helical cones to achieve different spiral forms. Penrose and Bennettıs invention made possible an adjustable continuum of spiral shapes. Apparently very few early mechanical helicographs survive today. In particular we have found only one other example of the present form, that a gift by Stanley himself to the Science Museum, in 1876. (7287) $7500.

 

Draws Epicycloids, Transcendental Curves, etc. Click on any image for a larger view.

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RARE RACKWORK CURVE GENERATOR, c.1850, unsigned but attributable to Hempel, 5-3/4" (15 cm) long, very finely crafted of lacquered brass with steel fittings and ivory handle. The instrument is based upon a guide bar and parallel rack. There are two pinion gears, one fixed at the end of the bar, driven by the rack to rotate either the short or the long extendable clampable ink pen arm, extendable to vary the ellipticity. The second pinion is on the vertical pillar, fixed to the base (which has twin pricker points and a clever spiral cut springiness). The guide bar is fixed to the ivory handle, all of which is rotated atop the pinion / pillar assembly, thereby driving the pen in cycles and epicycles simultaneously, giving an elliptical trace on the paper. The distance between the two pinion assemblies may be varied, and clamped, to vary the size of the ellipse. Condition is very fine, and functional, complete with its original fitted wood case bound in black simulated fishskin and lined in dark blue velvet. An auxiliary pencil holder must be lacking, and a little push-pin is present.

This design was patented in 1842 by Messieurs Hamann and Hempel, mécaniciens of Paris, listed at 18 rue Folie Méricourt in the Marais in Paris. It is an innovative form, not represented in Hambly's book, and of which we know two other examples, one in the Conservatoire nationale des arts et métiers (CNAM), the other listed in Tesseract Catalogue 63 Item 36. The patent claims the ability to produce straight lines, circles, ellipses, epicycloids, and even transcendental curves with this apparatus. It does in fact relate to the design of the volute compasses of David Lyle in the King George III Collection, but without the helical drum necessary for the most complex curves (see Morton and Wess). A most rare instrument of high precision, and splendid condition. (9246) $2500.

 

Victorian Full-Circle Protractor, c. 1862 Click on any image for a larger view.

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FINE VICTORIAN BRASS PROTRACTOR, English, c. 1862, signed "J. Gargory, 41 Bull St., Birm'm." This 6-1/4" (16 cm) diameter full-circle protractor is divided every degree from 0° to 360°, and back again, boldly labeled with easy to read numerals. Both crossbar and circumferential edge are beveled down to the surface of map or chart. Condition is fine, retaining much of its original lacquer finish.

James Gargory is listed as optician, jeweler, goldsmith, and mathematical, mining, surveying, and optical instrument maker. Clifton gives working dates of 1835 - 1862, always on Bull Street in Birmingham, but at the present address only in 1862. (9305) $325.

 

Patented American Ellipsograph Click on any image for a larger view.

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RARE AMERICAN ELLIPSOGRAPH -- F. BOWLYıS INSTRUMENT FOR DESCRIBING ELLIPSES, c. 1870, signed "F. Bowlyıs patent Janıy. 14, 1868." This most unusual instrument is constructed with framework of beautifully grained tropical hardwood, and with linkages and fittings of brass and boxwood. When closed up it measures 16-1/4" (41 cm) long and only 5/8" x 1-7/8" (1.6 x 4.8 cm) in overall cross section. The frame (whose form reminds one of a violin bow) has fixed point and index pointer for orienting and stabilizing on drawing paper, and the linkage terminates in a holder for pencil lead or ink pen (not present). A boxwood rule is graduated in half inches from 1 to 21, each divided in eighths, and has two sliding swivel clamps (for adjusting size and ellipticity) attached to an extending hardwood arm and to a sliding brass linkage respectively. The instrument is totally functional and in excellent condition throughout.

This unusual ellipsograph is the invention of Franklin Bowly of Winchester, Virginia. He claimed "The advantages of this instrument are, great simplicity of arrangement, expedition and convenience in its application, and accuracy with which it describes an ellipse of any desired proportions within wide limits of size, ..," and in 1868 he was granted U.S. patent 73,290. Bowly recommended the instrument for draftsmen in general, using pen or pencil point, but also to cut glass for pictures frames, etc., using a diamond point! Period literature acknowledged the invention, e.g., in Knight's American Mechanical Dictionary (1876). A beautiful example of this clever design, and the only one we have seen. (9273) $5950.

 

Good French Ironwork Click on any image for a larger view.

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FINE IRON OUTSIDE CALIPERS, French, 18th century, measuring 21-1/2² (55 cm) tall, they feature long three-leaf hinge plates with finely shaped recurved decoration leading to the inward-facing tapered four-sided points. The hinge plates form a full right angle builderıs square, when open to a scribe mark on the hinge. The hinge itself has beveled rectangle decoration leading to double-S supporters. In fine condition, a wonderful example of early outside calipers, for builderıs and / or gunnerıs use. (7276) $2950.

 

Swiveling Set of Large Boxwood Architect's Rules Click on any image for a larger view.

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REMARKABLE BOXWOOD DRAFTING RULES, English, c. 18th century, the four double-sided rules cut as single panes of boxwood measuring an extraordinary 3-5/8" x 11-3/8" (9 x 29 cm), and mounted as a swiveling set with brass hinge. Each face (except the backside of the bottom one), is divided with two sets of linear reduction scales with transversal interpolation to the one-hundredth part of one unit. Each scale is identified with a "5" and with a two-letter code (AD through AI, BK, BA through BG). Two scales have old hand-written ink labels "63 (68) to an inch." Condition is very fine throughout except for a number of stains just on the outer surfaces of the set.

This is the first such set of early drafting rules we have seen. They would be used with dividers to lay out, or read out, distances on scale drawings, with a choice of 14 scales. A century later one would find cased sets of individual rules, and made not of boxwood but of ivory or ivorine. (9253) $1650.

 

Scales for Official French Mapping, c. 1800 Click on any image for a larger view.

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IMPORTANT HIGH-PRECISION CHART RULE, French, c. 1800, signed "Ferat a Paris; Depot G'al. de la Guerre 81." This heavy gilt brass rule, 8-3/4" x 2-3/4" (22 x 7 cm), is exquisitely engraved on both sides with reduction scales of equal parts, the scales numbered 4, 5, 6, and 7. Each scale is linearly divided, with transversal scale at the end subdividing the main divisions down to 1/100 or 1/50 part. Designed for the metric system, they are labeled with the scale reductions and usages, e.g., "Echelle de 2 Millimetres pour 100 Metres (Pour les dites Cartes reduites et a graver)." Besides scales for the engraving of charts, there are ones for use on maps of the "Reconnaissances Militaires," and for the "Canevas de la Topographie" (the baseline grid topographic maps). Divided with high precision, one still sees many of the layout marks, and engraving guidelines. Condition is fine noting some scratches and minor discolorations. It is complete with its original protective card case.

This is the first "official" French rule we have had designed for the construction, engraving and readout of military charts. It was part of the War Department's "Depot General" which was charged with furnishing the necessary charts and plans to the armies, as well as training Geographical Engineers. It is further significant in being signed by the maker. Ferat is recorded from 1799 to 1806, relocating frequently, through four different Paris addresses over seven years (see Marcelin). The young Gambey worked for him. The fineness of Ferat's engraving is truly exceptional. (9221) $2800.

 

Early Engraved Ironwork Click on any image for a larger view.

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EXCEPTIONAL PARALLEL-JAW CALIPERS, European, c. 1800, signed indistinctly "J. Peilland" (or "J. Peillaud"). These fine worked-steel calipers open by finger pull from 26-7/8" to 49-3/4" (68 to 126 cm). The 4" long jaws thus extend from direct contact to 22-3/4" (58 cm) separation, which is measured by graduations on both sides of the extended central pull shaft. Both sides are divided every half centimeter, apparently, from 0 to 50. The jaws are precisely fashioned, and their movement is quite parallel with the pull rod riding in a long slot. The finger hold and finger pull are well shaped for aesthetics and function, and the jaw heads are beautifully engraved in the steel with graceful floral patterns that join up when the jaws are in contact. Condition is fine noting general spotting.

The original shaped and fitted wood case is present, adding a wonderful appeal to the instrument. The case is bound in red Morocco leather, and lined in chamois leather; it is in generally good condition noting stains and loss of the closure hooks. A fine instrument, provenanced to the Rullier collection. (9266) $3950.


Defensive Dividers! Click on any image for a larger view.

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WROUGHT IRON DIVIDERS / DAGGER, European 17th /18th century. Measuring 13-1/2" (34 cm) overall, this rather primitive pair of dividers is well constructed, with a five-leaf hinge with pommel knob, twin tapering arms, and double hilt. It has a good "heft" for use as a dagger. Condition is good, apparently all original, noting some pitting to the surface. The application of the hilt to dividers, making them into a significant close range weapon, is well documented. For example, one finds a rather formidable 16th century dagger / divider compendium in the Museo Galileo in Florence, described by Bonelli and Settle. (7259) $2650.

 

"Old" and "New" Measure Click on any image for a larger view.

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UNUSUAL CALIPERS / FOLDING RULE, French, 19th century, 7" (18 cm) overall (closed), of brass with iron fittings and end stops. The folding rule is divided from 0 to 12 French inches, by twelfths, and from 0 to 10 centimeters, by millimeters. The hinge center has a charming pierced iron six-pointed star, and the rule closes on shaped stellate designs. A sliding clampable cursor fits over the rule, forming outside calipers with readout in old and new (i.e., metric) measures. The cursor is pierced with a six-pointed star on one side, and with a "G" (for the maker), on the other. Condition is good noting some corrosion to the iron. We have seen only one other example of this folding combination, that clearly by the same maker, and in fact signed "Gillot." (8307) $1450.

 

 

 

 

 

 

 

 

 

 

 

 

Measuring by the Foot of the King Click on any image for a larger view.

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EXQUISITE "HALF THE KINGıS FOOT" RULE, French, mid-18th century, signed "Duhamel à Paris." This folding brass rule opens to 6-7/16" (16 cm), and is divided on one side with a "Demy Pied De Roy" scale of six early French inches ("pouces"), the terminal inches divided into twelfths of an inch ("Lignes"). Both sides bear the most elegant symmetrical patterns of hand engraving. A lovely rule, in very fine condition, by Jean-Jacques Duhamel father or son.(9306) $1650.


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