Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ... draughtsmen .. (1897)
Willson, Frederick Newton, 1855-1939 · Princeton, N.J., The author · leaf 160
f 30; -i„ b6lt -d-r- 454. Triangular-threaded screws.— United States Standard.—The proportions devised by Mr. WilliamSellers of Philadelphia have been so generallyadopted as to be known as the United StatesStandard. They are given in the table on the3iA next page. i Fig. 312 shows a section of the…
Mechanical drawing · Lettering
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