OUGHTRED, TRIGONOMETRIA: HOC EST, MODUS COMPUTANDI TRIANGULORUM LATERA & ANGULOS, LONDON, 1657, CONTEMPORARY VELLUM

FIRST EDITION, 2 parts in one volume, 4to (185 x 142mm.), engraved portrait of the author by W. Faithorne, engraved and woodcut diagrams in text, last leaf blank, contemporary vellum, red cloth chemise, red morocco-backed cloth slipcase, rather browned, first few leaves of second part soiled at head, paper labels on spine chipped with loss

Robert B. Honeyman (1897-1987), bookplate, sale in these rooms, 10 November 1980, lot 2375, Helmut Schumann; bought from Schumann. Zurich, 1987

Tomash & Williams O55, O54; ESTC R234400; Henderson pp.65-66 no. 43.0; Wing O589

the condition of this lot is as described in the catalogue description
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective, qualified opinion. Prospective buyers should also refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE."

This work was most likely written about 1618, but not published until 1657, edited by Richard Stokes and Arthur Haughton. It was in this book that the abbreviations sin and tan were introduced. An English edition of this work was published a few months later (see lot 482). The general title of this copy is the issue with line 6 of title beginning "Collectus". The second part of this work is Oughtred's Canones sinuum, tangentium, secantium: et logarithmorum pro sinubus et tangentibus, which has a separate title page and signatures.