CEULEN, DE CIRCULO & ADSCRIPTIS LIBER, LEIDEN, 1619

2 parts in one volume, 4to (238 x 172mm.), half-title, engraved portrait of the author on title, woodcut initials and diagrams in the text, old reused vellum, later spine label, last leaf in part 2 with catchword LV., lacking pp. 41-54 of part one, occasional marginal repairs, a few leaves trimmed, new endpapers; sold not subject to return

"N. Borrimans’", signature on preliminary blank; the antiquary James West (1704-1773), "Bibliotheca Westiana, April, 1773", inscription on half-title; Samuel Patterson, Catalogue of the Curious and truly Valuable Library of the late James West, 29 March 1773, lot 2068; "R. Cotton", signature on half-title; Zisska & Kistner, Auktion 22/I, 25-28 October 1993, lot 1424, Erwin Tomash

Tomash & Williams C59; Hoogendoorn p.197 Ceu04L; STCN 059620803

Condition is described in the main body of the catalogue, where appropriate.
"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."

An edited Latin translation of Ceulen’s Van den Circkel, 1596, with additions from his posthumous Fondamenten of 1615, done by van Ceulen’s pupil Willebrord Snel. Ceulen’s 33-place value for π is given on p.92.