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 130
nt and equal. —Let ABC (Fig. 146) be theequilateral triangle. Bisectthe angles of the triangle by-lines A «, B ^, and C c. Joinab, and on this line describea semicircle touching the sidesof the triangle. To avoidconfusion of lines, this semicircle is omitted in the figure,only the point (^/) where… … Fig. 146. 108 IX, SHEET-IKON AM) (oPPEK-PJ.A 1E WOKKER. ^/,/^and ge will be the adjacent diameters of three semi-circles, the curves of which will touch the triangle ABC. To insoibe i?i a given circle threeequal semicircles having their diam-eters adjacent.—Find the centre ofthe circle A Fig. 147J…
Metal-work
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-134-367.webp)
