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COMPLETE SET OF 50 LATEST TESSERACT CATALOGUES, American, 1998 2020. For sale are brand new copies of Catalogues #62 through #111, each containing 40 pages of early scientific instruments for sale, all fully illustrated, described, and priced. Included are all manner of unusual instruments of astronomy, microscopy, dialling, navigation, surveying, drafting, calculation, demonstration, experimentation, technology, surgery, diagnostics, dentistry, and ophthalmology. $200.


Including items less expensive, recent acquisitions, objects needing care, unidentified items, even general antiques, etc. Click on any image for a larger view.

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ADMISSION TO THE EXPOSITION OF INSECTS, French, 1883, the 3-1/2" x 4-3/4" (9 x 12 cm) card printed with a charming border of vines filled with all manner of creatures. Very fine. (S52) $75.


NEAR-SIGHTED MODEL EYE, c. 1900, standing 11-1/2" (29 cm) overall on turned wood piller. The 3-3/4" (9.5 cm) diameter spherical metal eyeball is fitted with a single eye lens, marked "M" (for Myopia, or near-sightedness), which projects the scene onto a ground glass "retina", much as in a camera obscura. In front of the lens is a swivelling fixture giving a choice of red or green filters (rather than corrective lenses). An attractive display. (S51) $750.


THE "TINY ATOM MOTOR AND VARIABLE SPEED POWER APPLICATOR" KIT, American (Cleveland), c. 1955, contained in the original 6-3/4" x 6-3/4" x 1-7/8" (17 x 17 x 5 cm) printed card box. Made by "Wilson's of Cleveland," the set includes motor, gearing, housing, pulley, instruction book, and price list, all unopened, unused, and in excellent condition. (S29) $275.


FINE IVORY SLIDE RULE, English, 19th century, signed "Buss, Maker, 33 Hatton Garden, London", 9" (23 cm) long, with double-sided slider, the rule engraved both sides with scales for concentration of alcoholic beverages, etc. Excellent condition. (S53) $325.


NEUBAUER BLOOD PLATELET COUNTING CHAMBER,American, c. 1940, signed "Spencer, Buffalo, USA", and serial-numbered.. This thick glass microscope slide bears finely-ruled grids for counting the frequency of various platelets in a tiny blood sample. Condition is very fine, now in an associated case. (S54) $150.



HEYS SAW FOR CRANIAL SURGERY, English, c. late 18th century, signed "Crooks, Sheffield", 6-1/4" (16 cm) long, finely crafted with polished steel blades and checkered ebony handle. Excellent. (S55) $275.


CASED SILVER HYDROMETER, probably English, early 19th century, the hydrometer measuring 5-1/8" (13 cm) long, with weighted base and calibrations 45-102 repeated on two sides of the stem.Designed for measuring the densities of liquids, it is complete with the beautifaul original turned wood case, all in very fine condition. (S57) $320.



EARLY PARALLEL-PLATE COMPRESSORIUM FOR MICROSCOPE SPECIMENS, English, c. 1847 - 1856, signed "Smith & Beck, 6 Coleman St., London". The 1-3/4" x 3-3/4" brass stageplate supports the articulated arm with gimbal mount. This allows the specimen to be "squished" between the lower fixed flat glass disk and the upper (now missing) one. It is a fine, uncommon, early example, in generally very fine condition. (S58) $425.


OPISOMETER, French for the English market, c. early 20th century, "Depose H C," 4-5/8" (12 cm) long, plated, "Inches to Miles or Verstes" and "Centimetres to Kilometres," very fine. (S14) $75.


VERTICAL ILLUMINATOR FOR MICROSCOPE, c. 1900. This unusual accessory fits betqween the objective lens and the microscope tube, on its standard RMS threads. An insertable thumbscrew has a split nose for supporting a small transparent glass disk. Portoles on either side allow light to enter. With the disk turned to about 45 degrees to the optic axis, the view through the microscope is unimpaired, but light will reflect down onto the specimen, giving illumination exactly from above. Made of bright lacquered brass, it is in very fine condition, complete with a box of many glass disks. (S60) $160.


TURNED WOOD COMPENDIUM. Turned of beautifully grained wood, this 2-5/8" long cylinder has a lens cover at one end, and a storage compartment and specimen support at the other. The singlet lens is mounted in horn, and has a focal length of about 2-3/4", giving fine magnified views. Very fine. (S61) $180.


RARE MICROPHOTOGRAPHIC SLIDE OF THE SIGNING OF THE U.S. DECLARATION OF INDEPENDENCE, English, 19th century, signed "J.B.D." for John Benjamin Dancer. The tiny microdot is sealed under cover glass on the 1" x 3" glass slide, all in excellent condition. This image, number110 in Dancer's series, is particularly rare. (S62) (SOLD)


PHARMACEUTICAL EXTRACT CON-TAINER, BY THE SHAKERS, American, c. 19th century. This 2-3/4" tall simple card container has applied labels identifying the intended contents, and declaring "PREPARED IN VACUO at the LABORATORY OF THE UNITED SOCIETY, D.M., SHAKER VILLAGE, NEW LEBANON, N.Y." We have located another example of this label in the library collections of Hancock Shaker Village. A rare Shaker survival, in good condition noting general scuffing. (S63) $160.


INSTRUMENTAL AUTOGRAPH -- SPLENDID SIGNATURE BY IMPORTANT MAKER, French, c. 1750, the 2" (5 cm) diameter turned brass plate (baseplate of a small telescope) signed "Pafsemant Ingenieur du Roi au Louvre a Paris." Claude Simeon Passemant was the premier instrument craftsman for the rulers and most important personages of the period. This is a very fine "souvenir" of his craft. (S47) $295.


RARE "ART NOUVEAU" WATCH-CASE AMMETER, c. 1900, the 2" (5 cm) diameter plated case with glazed dial beatifully signed "Amperes," and with 0-30 scale.There are upper and lower terminal points, and the interior has a significant ring magnet and coil spring. Light wear. (S43) $275.


SELF-REGISTERING SOVEREIGN SCALE, English, c. early 19th century, made of cast brass, 3-3/4" (9.5 cm) long, signed "Harrison" and bearing a crown, with inserts to exactly balance gold sovereigns and half-sovereign coins.Fine noting some darkening, complete with a portion of the original card case. (S46) $95.


CHINESE WOOD COMPASS, c. 19th century, the 3-5/8" (9 cm) diameter thick wood disk with small inset glazed compass, and hand painted in black and red with seven concentric bands of geographic and calendrical scales. The reverse is painted with an inscription of seven Kanji characters. Condition is good noting small central cracks to the wood and glass, and traces of an old varnish. A rather early example of this continuing Chinese tradition. (S42) $250.


ARCHITECT'S RULE IN BOXWOOD, English, 19th century, 6" (15 cm) long, signed "Thomas Bradburn & Sons, Makers, Birm'm, Established 1834," and stamped with the British broad arrow War Department mark. Condition is good with a tiny hole and crack. Scales on both sides include 180 degree rectangular protractor, four chart reduction scales, chords, six more reduction scales, another chord scale, and two inch-fraction scales finally subdivided by transversals. (S39) $55. (SOLD)


UNUSUAL AMERICAN PEDOMETER, last quarter 19th century, the 2" (5 cm) diameter plated glazed case mounted with bail and belt hook. The entire "nomo-graphic" dial rotates as the internal pendulum is swung, and has adjustable pointer. Fine and interesting American innovation, with patent dates of 1877 and 1878., (S45) $240.


POCKET DOUBLE MICROSCOPE, probably French, c. 1900, measuring 2" (5 cm) overall, of turned brass, the main tube holding low and high power lenses, in removavble cells, usable singly or in combination. The low power has a focal length of 1", useful for larger objects. The high power has a thick lens focussing directly on its plane end, for viewing tiny objects, even aqueous ones. Fine condition. (S41) $65.


SLIDING CALIPER RULE, English, 19th century, signed "E. Preston & Co., Birmingham," and with the "E.P." logo. Made of brass and boxwood, it measures 4-1/2" (11 cm) long closed, and extends another 3-3/4", with measurement in inches (to eighths) and centimeters (to milli-meters). Condition is good noting stains and wear. (S40) $110.


AMERICAN DENTAL EXTRACTOR, 19th century, signed "Kuemerle." The steel forceps are 7-1/2" (19 cm) long overall, elegantly shaped and with a fine fit in the hand. The blades are serrated, and the handles are incised with cross-hatching. Fine. (S37) $135.


BRASS POCKET COMPASS, c. 1800, 1-7/8" (5 cm) diameter, with glass over good early needle, substantial turned body, plain interior, no lid, otherwise fine.(S35) $45. (SOLD)


UNUSUAL DOUBLE STOPWATCH, Swiss, c. 1900, 2" (5 cm) diameter, with bail, winding knob, twin controls, three hands, double hinged plated case back. Good, and at least part-functioning. (S44) $85.


VICTORIAN MICROSCOPE EYEPIECE, English, second half 19th c., the brass tube 35.73 mm in outside diameter. Condition is excellent. (S30) $40.


FINE MICROMETER EYEPIECE, German, c. 1900, signed "E. Leitz, Wetzlar," 2-3/4" (7 cm) tall (closed), with 10x ocular focusing on the finely ruled glass reticle. A ruled index line is driven over the reticle by precision calibrated micrometer drive. Very fine. (S16) $280.


THE ALLERGIST -- AN AMUSING HAND-CARVED WOODEN FIGURE, Austrian, 1958, signed "Jaschke" and dated. 5-1/2" (14 cm) tall, fully hand-carved and painted, with a rectangular wood base..Fine condition. (S17) $95.


THE OTOLARYNGOLOGIST -- AN AMUSING HAND-CARVED WOODEN FIGURE, probably Austrian, mid-20th century, 5-1/2" (14 cm) tall, fully hand-carved and painted, with a rectangular wood base..Probably Jaschke manufacture. Fine condition. (S18) $95.


THE ENT SPECIALIST-- AN AMUSING HAND-CARVED WOODEN FIGURE, probably Austrian, mid-20th century, 5-1/2" (14 cm) tall, fully hand-carved and painted, with a rectangular wood base. The physician is shown with his ear syringe, tuning fork, light reflector, eyeglasses, and very full beard! Probably Jaschke manufacture. Fine condition. (S20) $95.


AO SPENCER MICROSCOPE OBJECTIVE, American, mid-20th century, 43x, N.A. 0.66, #950162. Excellent. (S23) $70.


SPENCER LENS CO. MICROSCOPE OBJECTIVE, American (Buffalo, N.Y.), , mid-20th century, 95x, N.A.1.25, Hom. 1-1.8 mm, # 574493. Very fine. (S24) $80.


STEREOSCOPE FOR VERASCOPE VIEWS, French, early 19th century, signed. The handheld brass stereo viewer is 4-1/2" (11.5 cm) across, with side panels that latch into place, and slotted arms that swing down as carriers for stereo views. In fine condition, it folds flat for portability. (S26) $160.


HIGH POWER BINOCULARS, probably French, c. 1900. The brass system opens from 5-3/4" to 8-1/2" (15 - 22 cm) long, the parallel tubes hinged for adjustable calibrated interocular separation. Cleaned but good. (S27) $180.


THE PATENTED BIASCOPE, American (Rochester, N.Y.), c. early 20th century, by Wollensak. Measuring 3-3/4" wide, these pocket binoculars have 6x magnification, with communal focusing by central lever. Fine with light wear. (S28) $150.


KALEIDOSCOPE, c. 1900, the 6-5/8" (17 cm) long,body of heavy card bound in colored embossed papers. Twin internal mirrors give six-fold symmetric images of the colored glass fragments. Condition is good and functional, noting some wear, plus breaks to the ground glass end piece. (S21) $195.


ATOMIZER, French, c. 1900, 5" (13 cm) long, striped blue and white glass and cast metal. Excellent. (S2) $85.


GERMAN "POCKET" GLOBE, c. early 20th c., signed "Die Erdkugel, Verlag v. Z.&B." The 3" (7.5 cm) terrestrial globe is made of card, mounted in each hemisphere with 12 lithographed gores and a polar calotte. Land is tan and water green, and many ocean currents are shown. Condition is good noting rubbed spots. (9022) $495.



WIDE-ANGLE PHOTOGRAPHIC LENS CONVERTERS, c. late 19th c., the two 1-1/4" (3.2 cm) diameter brass cells engraved "5 x 7, W.A.," one labeled "EMIL". In excellent condition, in their compartmented carrying case. (S7) $35.


CENCO'S LECTURE TABLE GALVANOMETER, American, c. 1930, signed "Central Scientific Co., Chicago." Standing 14-1/2" (37 cm) tall overall, with a circular wood base, three leveling screws, and a glass dome, the galvanometer has a permanent magnet (with patented rotation about the vertical axis for zero correction), a suspended copper wire coil attached to the double needle, and a double readout scale (front and back, for visibility from both sides). In Cenco's catalogue we find that a deflection of one scale division is produced by a current of only 0.0000136 amperes. Condition is good except for a large crack in the dome, the needle suspension wire present but broken, and one terminal post missing. (S11) $230.


INVALID FEEDER, English, c. 1920, "W. Adams & Co. 1917," soft-paste porcelain cup 4-5/8" (12 cm) in diameter, with spout and side handle, very fine. (S15) $145.





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