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)
edges B and C. That inFioure 4 is called a trianorle of 60 deo^rees, its ed^-e Abeing at 60 degrees to B, and at 30 degrees to C. Theedges P and C are at a right angle or an angle of 90degrees in both figures ; hence they are in this respectalike. By means of these triangles alone, a greatmany… … Fig- 5- in Figure 5, in which the triangle, Figure 3, is shown inthree positions marked D E F, and that shown in Fig-ure 4 is shown in three positions, marked respectivelyG H and I. It is obvious, however, that by turningI over, end for end, another position is attained. Theusefulness in these…
Mechanical drawing
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