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Note 171 jpg

Summary: of the points of the voussoir from the line through h on plan The true widths of the surfaces as at gg1g2G can be taken from the elevation the other faces being treated in a similar way Fig 121 The developed figure with its sides revolved on the joints Hh1 Gg2 and gg1 see Plan will then form the voussoir or keystone

Image Dimensions: 500 x 592