Science and art drawing : complete geometrical course ; consisting of plane and solid geometry, orthographic and isometric projection, projection of shadow's the principles of map projection, graphic arithmetic and graphic statics (1895)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan · leaf 177
Fig. 287. iS6 PRACTICAL PLANE GEOINIETRY Problem 179. The transverse and conjugate diameters of an ellipse being given,to find the foci. Let AB and CD be thetwo diameters bisecting eachother at right angles in E.5 With C or D as centres, andradius equal to EA, set off onthe transverse diameter… … To construct an ellipse hy means of intersecting arcs. Divide the space between each focus and E into any numberof parts. Tliey need not be equal; in fact, it would be better ifthey were closer together as they approached the foci FromF and G as centres, with radii equal to A4 and B4, A3 and B3,,A2…
Geometrical drawing
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