Engineering and Contracting . I 1 1 1 — — — ?^~ ~~ ^ ^ r^ ?^ ^ ,_^ =« - _ , , , , -^ — — — ?— =™- — ?— ?— — 1— — — — — 25 20 ^ — •—. ^ —n ___ —1 —1 — — — — -^ ?^ = = =J — Id ^^ „ __- :^ s^ ^ — — — _ ^ ^ ^ ^^ :^ ^ =— — — — —? — — -^ — — — — — t> 1 10 1 5 2C 2i 30 Fig. 2. were secured, wliich it is believed will be ofvalue to architects and engineers. Thechief result of the work has been the de-vising of a method to save time and labor with parallel chords; these arc, however,less valuable for roof trusses where far rusTANCE Between Trusses O. 5. made with vertical steel fish plates an
Engineering and Contracting . I 1 1 1 — — — ?^~ ~~ ^ ^ r^ ?^ ^ ,_^ =« - _ , , , , -^ — — — ?— =™- — ?— ?— — 1— — — — — 25 20 ^ — •—. ^ —n ___ —1 —1 — — — — -^ ?^ = = =J — Id ^^ „ __- :^ s^ ^ — — — _ ^ ^ ^ ^^ :^ ^ =— — — — —? — — -^ — — — — — t> 1 10 1 5 2C 2i 30 Fig. 2. were secured, wliich it is believed will be ofvalue to architects and engineers. Thechief result of the work has been the de-vising of a method to save time and labor with parallel chords; these arc, however,less valuable for roof trusses where far rusTANCE Between Trusses O. 5. made with vertical steel fish plates andtliroiigh bolts. .K purlin rested on eacb. 2= == = = = = — ^ := z^ — = =: = ;^ — c 1 i s ~ 1 E E = = u ~ — ^ — = — = = = E = = — ~ :il; t= ^ — = c = = = s ^ — = = = S = = A — = t — = — = = = ^ := iz: = i 1 ) 1 > 1 1 1 1 1 i ?20 Span in Fbbt Fig. 3. by presenting data in a form most con- •Abstrated from Bulletin No. 16, Univer-sity of Illinois Engineering Experiment Sta-tion. of Architecture, University ofIllinois. Urbana. 111. more varied conditions must be arbitrarilylimited in order to make such methods ap-plicable. The results are then of doubtfulworth. A more practical method of inves-tigation w^as therefore chosen. For a sin- KuMBER OF PanelsFig. 6. apex of the principal and supported the-rafters on which was laid %-in. matchedsheathing covered by a painted tin roof. In accordance with the usual custom ofengineers the robf was assumed to support March I 1, i)o8. ENGINEERING-CONTRACTING 159 a snow load and wind pressure at the sametime, although the writer believes that thisextre
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