Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 215
oth compressive. Measur-ing, we find that BG and GF scale4,100 and 1,875 pounds respectively.Now draw a polygon for joint(3) or (6) since there are but two un-known forces at each joint. At (3) for instance, the unknown forces are those exerted by ch and <jh^the known forces being the load… … Fig. 25. 174 STATICS 41 GBCIIG is the polygon for the joint, and since BC acts down(see tlie polygon) CII acts up and HG down. Therefore, placethe proper arrowheads on cli and hg near (3), and record that thestresses in those members are compressive and tensile respectively.Measuring, we find that…
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-265-170.webp)
