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)
roblem is shown in Figure 253, which represents a 214 MECHANICAL DRAWING SELF-TAUGHT. quadrant of an ellipse, the approximate arcs C D^E, E F, F A having been determined by trial anderror. In order to space this off, for the positions ofthe teeth, a tangent is drawn at D, upon which is con-structed… … and F K = F A, and then measuring H L == I K, wehave finally G L, equal to the whole quadrant of theellipse. Let it now be required to lay out twenty-four teethupon this ellipse; that is, six in each quadrant; andfor syrametrys sake we will suppose that the centreof one tooth is to be at A, and…
Mechanical drawing
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