The watchmakers' hand book: intended as a workshop companion for those engaged in watchmaking and allied mechanical arts

"The watchmakers'' hand book : intended as a workshop companion for those… by Claudius Saunier is a technical handbook written in the late 19th century. It is a comprehensive reference for watchmakers and allied mechanical trades, focusing on practical methods, materials, tools, measurement, repairs, and finishing techniques to support daily workshop work. The opening of the handbook presents a transcriber’s note on formatting, followed by period advertisements, the title page, and a preface explaining the American edition’s practical aims, expanded content, modernized tooling, integrated illustrations, and thorough indexing. An extensive index outlines the breadth of topics, after which Part I begins by arguing that arithmetic, geometry, and drawing are essential foundations for competent watch repair and construction despite interchangeable manufacturing. It then offers concise refreshers on calculation signs, powers and roots (including square-root extraction), proportions, and the elements of practical geometry (circles, angles, plane areas, and volumes). The text proceeds to basic drawing practice and conventions, tracing and transferring methods, and key instruments (rules, protractor, scales, sector, proportional compass, vernier, micrometer screw), before introducing core geometric constructions for perpendiculars, parallels, subdivisions, and angle replication—ending mid-topic on subdividing an angle.