. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. larger thanAD; then form an instrument ADE with laths or slips of wood, and make itfast by a cross slip of wood GH. By moving the whole instrument, so that thetwo edges DA and DE may slide on two pins A and D, the angular i)oint 1) ofthe instrument will describe the segment of a circle, and if the pin be taken outof A and put in the point B, the other portion DB of the segment ADB will bedescribed in the same manner. 2077. The covering of an ellipti
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. larger thanAD; then form an instrument ADE with laths or slips of wood, and make itfast by a cross slip of wood GH. By moving the whole instrument, so that thetwo edges DA and DE may slide on two pins A and D, the angular i)oint 1) ofthe instrument will describe the segment of a circle, and if the pin be taken outof A and put in the point B, the other portion DB of the segment ADB will bedescribed in the same manner. 2077. The covering of an ellipticaldome is formed by considering eachpart a portion of the surface of a (fit;.721.) is a vertical sectiontlirough the greater axis of the base;the otlier vertical section through theaxis at right angles being a semicircle ;tlie joints of the boards therefore fall inthe circumference of vertical circles. 2078. In the same manner the cover- tiy. ing of an annular vault whose section is semicircular is found, being on the same principlesas now shown for a horizontal dome, which will be evident from an inspection of Ji</. v\
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Keywords: ., bookcentury1800, booksubjectarchitects, booksubjectarchitecture
