The handy book; containing tables, rules and other information regarding the working of the precious metals
A 1914 trade handbook of tables, rules and working data on gold, silver and platinum, issued by the refiners Handy & Harman of Bridgeport and New York for jewellers and metalworkers. Line engravings show measuring instruments — micrometer screws with numbered dials, a caliper jaw, graduated scales — drawn in fine hatching with legible numerals useful for precision and measurement motifs.
