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 117
Fig. I :2. arc to meet the arcs DH and CH in H and H, and to complete the egg-shaped oval. ELLIPSE. … Fig. 1*3.To find the Centre and the two Axes of an Ellipse.—Let ELLIPSE. 95 ABCD (Fig. 113) be an ellipse: it is required to find itscentre; draw any two lines, as EF and GH, parallel andequal to each other ; bisect these lines as in the points 1and K, and bisect IK as in L; from L as a centre,…
Metal-work
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