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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)

Rose, Joshua · Philaelphia, H.C. Baird & co.; [etc., etc.] · leaf 114

An illustration from 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, leaf 114
POLYGONS. H3 senting the bottom of the thread are next marked in,as in Figure 151, extending from line 9 to line 10.Midway between these lines fine ones are made forthe tops of the thread. All the lines being pencilledin, they may be inked in with the drawing instruments,taking care that they do… … Fig. 152. angle to centre line 1, line two is drawn. The pencil-compasses are then set to half the diameter of thebolt, and from point A arcs 3 and\are pencilled, thusshowing the width of the front flat of the head, as wellas the diameter of the stem. From the point wherethese arcs meet line 2, and…

Mechanical drawing

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