How to work it; a manual for the use of the Ben Day rapid shading mediums and its registry attachments
A trade instruction manual issued by Ben Day, Inc. in New York in 1913, teaching commercial artists and engravers to operate the Ben Day shading-screen machine and its registry attachments. Numbered line engravings show the clamped frame, screen plate, roller and stylus on a workbench, with gloved hands in mid-operation—usable as period tool diagrams, hand studies and technical figure captions.
