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 202
that when the end of a blueprint is placedin position against the vertical face and the ball is allowed tofall to the bottom of the slot, the pressure exerted on thevertical face is quite sufficient to hold the print in place. Toprevent the balls from falling out of the slots sideways, wiresare… … Machinery Fig. 4. Rack for holding Blueprints while drying up out of the bottom of the slot to release the blueprint.(2) The fact that the water is allowed to drain off the printwithout defacing it in any way whatever. This rack is in-tended for small and medium sized prints, but it can also…
Mechanical drawing
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