Practical Centring Treating of the Practice of Centring Arches in Building Con
Practical Centring Treating of the Practice of Centring Arches in Building Con
Owen B 1860 Maginnis
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45 47) at the elevation of the frames where the bevelled edges are shown, only one-half of them, being covered with bat- tens. The plan of the centre, Fig. 48, also shows this more distinctly, and also the bevels of the frames wrought to the angle of the splay. Carpenters will require to exer- cise a little more care in constructing this form of centre than is usually done, as it is for a special purpose. Fig. 49 is the elevation of the large frame, and is slightly different in construction fro...m the smaller. Fig. 50 is the elevation of a Gothic window having jambs and soffit with a double flare or splay, which is done to break the excessive depth FIG. 51. of surface consequent on a thick wall. As the plan shows, two centres, which flare at different angles, will be needed here, or one centre with two flares of unequal angles. The first method is the best, however; that is, to make two separate centres and bolt them together so they will fit at the spring line, A B, in the manner necessary to enable the mason to properly turn his arch.
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