The author, an instrument-maker and member of the Bavarian Academy of Science, credits his knowledge of binary notation to Johann Bernhard Wiedeburg’s Dissertatio mathematica (Jena 1718), itself based on publications of Leibniz and Bernard le Bovier de Fontenelle. “Brander expressed the hope that [his] work on dyadics might serve the reader for recreational purposes, and perhaps even for keeping one’s personal accounts unintelligible to prying eyes” (Anton Glaser, History of binary and other nondecimal numeration, Los Angeles: Tomash Publishers, 1981, pp.65-66).
the condition of lots is as described in the catalogue description, 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."