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)
Fig- 3- 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 itsedo-e A is at that angle to edges B and C. That in re 4 is called a triangle of 60…
Mechanical drawing
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