
author
1885–1956
A practical early-20th-century technical writer, he produced clear, workshop-focused manuals on machining, forging, welding, and munitions manufacture. His books captured the hands-on industrial knowledge of a period shaped by rapid manufacturing change and wartime production.

by Douglas T. (Douglas Thomas) Hamilton
Born in 1885, Douglas T. Hamilton—also listed as Douglas Thomas Hamilton—was a technical author whose surviving records connect him with Canada by birth and later work in the United States. Bibliographic and memorial sources place his life from June 20, 1885 to September 26, 1956.
Hamilton is best known for a run of industrial manuals published in the 1910s, many through Industrial Press. His books covered subjects such as automatic screw machines, bolt and rivet forging, electric welding, cartridge manufacture, machine forging, and shrapnel-shell production.
Rather than writing for a general audience, he wrote for machinists, toolmakers, and factory workers who needed direct, usable instruction. That practical focus gives his work lasting historical interest today: his books show how manufacturing knowledge was taught, organized, and applied in the machine shops and war industries of the early twentieth century.