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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 121

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 121
the chamferA meets the side of the head at B, and does not,therefore, meet the arc C. The length of side lyingbetween B and D in the side view corresponds withthe part lying between E and F in the end view. I20 MECHANICAL DRAWING SELF-TAUGHT. If we compare this head with similar views of asquare… … the same distance between the chamfer circle and theside of the bolt (that is, the distance from J to K,being equal to that from L to M), the length of thechamfer N for the square head so gready exceeds thelength A for the hexagon head that the eye detects EXAMPLES IN BOLTS, NUTS, AND POLYGONS. 121…

Mechanical drawing

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