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 (1883)
^ O B; then withcentre F and radius FB describe an arc cutting thecircle ODG (tangent to OB at O) In the point D;then OD will be approximately equal to Oil the DRAWING GEAR WHEELS, 21^ error being the same as in the other construction andfollowino- the same law. The extreme simplicity of these two… … 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 214 MECHANICAL DRAWING SELF-TAUGHT. quadrant of an ellipse, the approximate arcs C D,E, E F, FA…
Mechanical drawing
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