Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 167
passes through the top block and downthrough the single pulley fixed at the lowerend of the derrick, from which the cord iscontinued and connected to a crab. Thetruss is now gradually raised to the height 7 it can be connected to others by purlins,ridge, etc. At the present time derrickcranes are… … H Fig. 536.-A, Joint between King-post and Head of Principal Rafter. B, Joint between Front of UpperRib and Collar Beam C Joint between Collar Beam and Principal Rafter and Iron Strap. D JointX \K??r& Rafter. E, Jointing of Lower Ribs, F, J^^^t^ T^sT-Zntlreceive Principal Rafters to Upper End…
Carpentry · Joinery
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