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. 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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