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)
NG SELF-TAUGHT. as In Figure 231, in which B represents a cyHndricalbody whose top face would, if viewed from point I, ap-pear as a straight line, while if viewed from point J itwould appear in outline a circle. Now if viewed frompoint E its apparent dimension in one direction willobviously be… … Fig. 231. which is the width of the ellipse. The length of theellipse will obviously be the full diameter of the cyl-inder B ; hence from E as a centre we mark points 3and 4, and of the remaining points we will speakpresently. Suppose now the angle the top face of Bis viewed from is denoted by the…
Mechanical drawing
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