Gothic architecture in France, England, and Italy (1915)
Jackson, Thomas Graham, Sir, 1835-1924 · Cambridge [Eng.] University Press · leaf 26
y Central and sight-lines tangent point the stonework comes again to the sectionof the mullion. The mullion thus becomes the modulewhich gives the detail of the tracery bar. On the leftof Fig. 119 is shown the method of setting out perfectlydeveloped tracery. From centre A a curve is drawnwith the… … Fig. 119. given are the central and two sight-lines of the tracery.Then the central and two sight-lines of the circle aredrawn, each of which must be tangential to one of thefirst three curves. The window arch again has its owncentral and sight-lines drawn from the centre C, whichare tangential to…
Architecture, Gothic
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