FINE IRON OUTSIDE CALIPERS, French, 18th century, measuring 21-1/2″ (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 builder¹s 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 builder¹s and / or gunner’s use.
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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 email@example.com.