Thank you for visiting our Tesseract web site. We have been full time dealers in early scientific and medical instruments since 1982. In addition to the web site, we publish several catalogues per year, each with dozens of instruments fully illustrated, described and priced, and are now up to Catalogue 91. Please contact us if you would like a single copy ($8), or if you wish to subscribe ($30 for four issues -- approximately one year).

We are always interested in buying single items or collections.

In addition to buying and selling early instruments, we can perform formal appraisals of your single instruments or whole collections, whether to determine fair market value for donation, for insurance, for loss, etc. We were recently engaged to appraise a major medical collection of several hundred items being donated to an American museum, and to appraise a major European collection of early scientific instruments, being insured for a loan exhibition.

David Coffeen, Ph.D
Yola Coffeen, Ph.D
 
Members

Scientific Instrument Society
Historical Medical Equipment Society
American Association for the History of Medicine
Antiquarian Horological Society
International Society of Antique Scale Collectors
Surveyors Historical Society
Early American Industries Association
The Oughtred Society
American Astronomical Society
International Coronelli Society
American Association of Museums
 
Co-Publishers
The Journal of the American Scientific Instrument Enterprise, is in its twenty-third year of publication, in its improved biannual format. This journal, which we co-publish, is dedicated to articles about the history of instruments made, sold, and/or used in the Americas. All twenty-two back volumes, featuring dozens of articles on all types of scientific instruments, are still available. Please see the web site for details: www.rittenhousejournal.org
 
Address

Box 151
Hastings-on-Hudson
New York 10706 USA

telephone: 1-914-478-2594

email: mail@etesseract.com