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)
| O B; then withcentre F and radius FB describe an arc cutting thecircle O D G (tangent to O B at O) in the point D;then O D will be approximately equal to O B, the DRAWING GEAR WHEELS. 213 error being the same as in the other construction andfollowing the same law. The extreme simplicity of these… … Fig- 253.dinary drawing instruments make them exceedinglyconvenient, and they should be more widely knownthan they are. Their application to the presentproblem is shown in Figure 253, which represents a MECI.. TNG SELF-TAUGHT. quadrant of an ellipse, the approximate arcs C D.E. E F, F A having been…
Mechanical drawing
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