Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 305
seenthat the trusses for the ribs have queen-posts ; this principle of construction givesgreat strength, and is in general favour forthis class of work. Alternative designs fortrusses are given at a and b ; as also forthe supporting timbering at d and e. Whena section of the arch has been… … Fig. 910.—Plan, Transverse SectionDevelopment of Soffit. proper height by supporting on wedges.To facilitate the pushing forward of thecentering, a method which was used manyyears ago in France is sometimes adopted,by fixing strong axle rollers as indicated atf. Thus when the wedges are taken…
Carpentry · Joinery
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