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)
Fig. 302. The saw driving-wheel D has wrought-iron armsscrewed into the wheel hub. The wooden segmentsaround the wheel have their grain lengthways, andbetween them are placed pieces of soft wood withthe grain across the rim. This acts to keep the 2~6 MECHANICAL DRAWING SELF-TAUGHT. joints tight,… … Fig. 303. struction. It is carried in a U-shaped frame F, whichis pivoted at y to a slide that is gibbed to the mainframe, and by operating the screw shown at X theframe F is set to the required level.
Mechanical drawing
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