The work that introduced the sector (proportional compass) to France, Denis Henrion's L'Usage du Compas de Proportion. This copy from the noted library of Erwin Tomash, whose collection focused on the history of computing.
This edition includes two plates, showing sectors produced in 1616 by the instrument maker Daniel Chorez.
Numerous in-line illustrations of mathematical concepts and tables, two almost full-page sectors, and two full-page sectors with the monogram of "DH".
The first edition was in 1618, the sectors quite simple, and the examples focused on maritime duties. By this 1631 edition, Henrion had updated the sectors to illustrate more complex usage, and had added additional examples including metals, polygons, solids and chords.
Physical Attributes -
Measures approx. 16.7 x 10.7 x 1.3 cm.. Pages approx. 16.3 x 9.5 cm. Vellum binding with double fillet border in blind to boards. Edges sprinkled in red and green. Illustrated.
Pages - iv, 147 (147 mislabelled 146), [1 - privilege]
Collation - 2, I8, K2
See pictures. Modern binding, little wear. A few graphite notes, Erwin Tomash's ticket, and an ink mark on blank unpaginated endpapers. A little toning to pages throughout. A brown spot on title page, approx. 1 cm.. Trimmed tight, occasional loss of portion of header titles. Very light intrusion of moisture at top edge, mostly can only be seen on the two plate pages, although if you look for it after that you'll notice a shadow of it. Two spots on page 127/128. Despite my nit-picking here, a clean book in a nice binding.
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