Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 249
1825 13 *■ ^K (3) F. ;oo351fcs. \\ (14) (13) \ (a^) \ … polygon for joint 6 or joint 7; for G it is PDEQP, EQ and QPrepresenting the stresses in eq and £/). At joint 7 there is nowbut one unknown force, namely, that in qr. The polygon for thethree others at that joint is ROPQ; and since tho unknown forcemast close the polygon, QR must represent that…
Architecture · Building · Carpentry
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