Hale, Joseph W. L. (Joseph Woodwell Ledwidge), 1886- · New York [etc.] McGraw-Hill book company · leaf 37
60° triangle draw the sec-tions la2, 263, etc. A linethrough point a parallel to lineAB contains the points b, c,d, etc., at the bottoms of thethreads. A perpendicular from point a to line CD gives point 5 on the outside ofthe thread. Similarly perpendiculars dropped frompoints by c, d, etc.,…
Mechanics, Applied
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