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 595
362), and join it to y. Let yrepresent the weight of the quadrilateral ABDE, and (2 theweight of the triangle BCD. The resultant of these two forces(Prob. 289) acts through G. This is the centre of gravity ofABODE. If the polygon had more sides, additional triangles wouldbe taken and treated in the… … Fig. 366.Of any irregular lamina.—Fig. 366. First suspend itfreely from any point a of its circumference, and from the samepoint attach a plumb-line, and mark its position on the lamina,as ah. Then suspend it in like manner from any other pointon its circumference, as c, and mark the position of…
Geometrical drawing
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