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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 142

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 142
£nd View Side View Fig. 185. A line at 75° for polygons having 12 sides. (( 72° 10 60° 6 From the point O to the numerals denoting theradius of the polygon is the radius across the flats,while from point O to the horizontal line drawn from I … Fig. 186. those numerals is the radius across corners of thepolygon. 142 MECHANICAL DRAWING SELF-TAUGHT. A hexagon measures two inches across the flats:what is its diameter measured across the corners?Now from point O to the horizontal hne marked iinch, measured along the line of 60 degrees, is…

Mechanical drawing

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