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 128
ABC (Fig. 139) be the given tri-angle ; let fall the perpendicularB d, and make A e half the height^B; bisect e C, and describe thesemicircle ^ ;/C ; erect the perpen- Fig. 139. dicular A i-, or side of the square,then Kstx is the square of equal area as required. … Fig 140 To form a triangle equal in area to a circle : Preliminary re?narks.—A cord stretched over the circum-ference of a disk 7 inches in diameter measures, from endto end, 22 inches. Hence, the diameter is 7 inches, andthe circumference 22 inches. This proportion holds goodfor all circles, no…
Metal-work
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