Mechanical drawing; a treatise on the drawing of mechanical and machine details (1920)
Jones, Franklin Day, 1879-1967 · New York, The Industrial press; [etc., etc.] · leaf 196
e right is turned upward. The tracing is first placed in the frame with the inked-inside next to the glass. Then the blueprint paper is insertedwith the sensitized face next to the tracing. After the frameis closed and locked, the tracing and the sensitized paper backof it are exposed to the light… … Fig. 1. One Type of Printing Frame used for making Blueprints on the tracing. This is due to the fact that the exposure tolight has a certain effect on the chemicals which form thecoating of the blueprint paper. The result is that those partsof the paper which have been protected from the light by…
Mechanical drawing
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