Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 292
Fig. 877.—Block for fixing between Head ofRibs as shown at A (Fig. 876). two rings of courses, the centre would notdirectly touch the second ring, therefore thecentres have to be constructed so as to givedirect support to each ring. This is gener- ARCH CENTERINGS. 267 … Fig. 878.—Half Elevation showing Centering to a Stone Arch; also Half Elevation of Centering to Internal Brick Arch. ally done by supporting each, ring upon one section (Fig. 882) it will be seen that the or more ribs, the case here dealt with being middle centre b is smaller. It is formed of so…
Carpentry · Joinery
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