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 588
s AB, OQ by BC, etc.OP, he to OQ, etc. Then abed is the force polygon representingthe forces acting at 0. Note.—The student should notice that the order of the lettersis taken in a negative direction, i.e. in the opposite direction inwhich the hands of a clock move. If the order were taken ina… … Fig. 357. Draw a polygon of forces as follows. Draw ah to representthe magnitude of the force W. The forces at P and Pt are each equal to half of W, so bisectab in c. Draw lines from a and h parallel to the bars QR andPQ, and meeting in d. Join cd. The length of each line in the polygon of forces,…
Geometrical drawing
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