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Note 172 jpg

Summary: 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 An isometrical projection of the keystone is also shown

Image Dimensions: 500 x 374