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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 63

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 63
scribed and 62 MECHANICAL DRAWING SELF-TAUGHT. the second an inscribed polygon. A regular poly-gon is one the sides of which are all of an equal, length. NAMES OF REGULAR POLYGONS. A figure of 3 sides is called a Trigon. polygon Tetragon. Pentagon. Hexagon. Heptagon. Octagon. Enneagon or Nonagon.…

Mechanical drawing

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