London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 279
258 Conslruclion o/Skew Arches. … He then takes two wooden moulds (one ofwhich is shown in^^. 111.)} which are por-tions of the same circle as the soffit itself.A mark being placed upon the i j icentre of each of these moulds, n]—~)the workman then proceeds tosink them into the stones at right angles tothis chisel-draught {seeJig.…
Architecture
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