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Mechanical drawing self-taught: comprising instructions in the selection and preparation of drawing instruments. Elementary instruction in practical mechanical drawing. Together with examples in simple geometry and elementary mechanism, including screw threads, gear wheels, mechanical motions, engines and boilers (1889)

Rose, Joshua · Philaelphia, H.C. Baird & co.; [etc., etc.] · leaf 20

An illustration from Mechanical drawing self-taught: comprising instructions in the selection and preparation of drawing instruments. Elementary instruction in practical mechanical drawing. Together with examples in simple geometry and elementary mechanism, including screw threads, gear wheels, mechanical motions, engines and boilers, 1889, leaf 20
THE TRIANGLES. Two triangles are all that are absolutely necessaryfor a beginner. The first is that shown in Figure 3, 20 MECHANICAL DRAWING SELF-TAUGHT. which is called a triangle of 45 degrees, because itsedge A is at that angle to edges B and C. That inFioure 4 is called a trianorle of 60…

Mechanical drawing

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