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 77
p the drawing. This exposesthe transparent fabric to permit the passage of light. Inmaking blueprints from such drawings, the method of pro-cedure is exactly the same as where ordinary tracings areused, but as the lines are transparent and the remainder ofthe drawing opaque, the resulting blueprint… … Fig. 31. Enlarged View of Tool used to draw on an OpaqueDrafting Fabric producing blueprints. The surface of the fabric is a dullbrown which reflects very little light into the draftsmanseyes, thus reducing eyestrain. It is possible to make a blue-print at any time before the drawing is completed…
Mechanical drawing
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