A practical work-shop companion for tin, sheet-iron, and copper-plate workers ... with numerous valuable receipts and manipulations for every-day use in the work-shop (1904)
Blinn, Leroy J. [from old catalog] · Philadelphia, H. C. Baird & co. · leaf 76
f^g 67- OCTAGON. 53 Cover.—Describe a circle that will cut the required Octa-gon (Fig. 67) ; draw a line that will cut the centre of twosections, as AI; erect the perpendicular line HF; letABCDEFJ be the given top or cover; divide the curvedlines BC and EF into any number of equal parts; fromthe… … Fig. 68. equal in length tothe curved lineBC (Fig. 67); divide BCinto the same number of equal distances, as in the curvedline BC (Fig. 67); from the points draw lines parallel toGE; make CD equal to CD (Fig. 67), and DH equal toDE (Fig. 67); make HF equal to the curved line EF(Fig. 67) ; divide HF…
Metal-work
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