The watch adjuster's manual;
A trade manual on adjusting watches by Charles Edgar Fritts, issued in 1904 by The Keystone in Philadelphia for working watchmakers and repairers. The wood-engraved figures show plan and section views of balance wheels, screws, cross-hatched plates, pivot tools and a dial-faced testing stand, all keyed with letters and numerals; useful for technical line work, mechanical diagram motifs and hatched shading patterns.
