Machine drawing; a text and problem book for technical students and draftsmen (1921)
Svensen, Carl L. (Carl Lars), 1884- · New York, D. Van Nostrand company · leaf 54
1 It Fig. 77. A Blue Print Frame. coated side down. Follow this with a felt pad and close the frame. Ex-pose to direct sunlight as indicated at II. The length of exposure variesfrom 30 seconds in strong sunlight with rapid printing paper to three orfour minutes under the same conditions with slow…
Machinery
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