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.
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David and Yola Coffeen both have enjoyed academic careers, as planetary astronomer and as linguist/educator. But since 1982 (yes, 1982!) they have been full-time dealers in early scientific and medical instruments, under the name Tesseract. Selling primarily by catalogue (over 100 issued so far) they also have a web presence at www.etesseract.com, and can be contacted at firstname.lastname@example.org.