Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 136
represented as shownin the drawings, usually as in the upper one. The linesrepresenting the top of the thread are fine, and extendat an angle entirely across the bolt, while those in-dicating the bottom of the thread are half-way betweenthe tops of the thread, are heavy, and stop short of thesides.…
Mechanical drawing
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