Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 276
in Fig. 833, and these divisions may be sub-divided as indicated. The object of bi-secting the arcs is to get the lines radial. , Setting- Out Curves for Large Archesof Moderate Rise. Arches of large span and moderate risecannot conveniently be struck out froma centre, owing to the length of the… … Fig. 834.—Drawing Curves of Arch without a Centre by means of a Frame. Fig. 835.—Enlarged View of Apex of Frame shown in Fig. 834. Fig. 836.—Alternative Frame to that shown in Fig. 834. Setting Out Curves with Radius Rod. Centres for segmental arches of largerdimensions, and others of irregular…
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