. Cyclopedia of architecture, carpentry, and building; a general reference work ... rs. The horizontal pieces / will receive theboarding, which will form a smooth conical surface. The spire above the drum is usually framed on the groundbefore being raised to its final position. It then may be raised partway and supported by temporary staging while the top is finishedand painted, after which it may be placed in position on the top ofthe drum. Domes. Timber domes have been built over many famousbuildings, among which may be mentioned St. Pauls Cathedral atLondon, and the Hotel Des Invalides at P
. Cyclopedia of architecture, carpentry, and building; a general reference work ... rs. The horizontal pieces / will receive theboarding, which will form a smooth conical surface. The spire above the drum is usually framed on the groundbefore being raised to its final position. It then may be raised partway and supported by temporary staging while the top is finishedand painted, after which it may be placed in position on the top ofthe drum. Domes. Timber domes have been built over many famousbuildings, among which may be mentioned St. Pauls Cathedral atLondon, and the Hotel Des Invalides at Paris. While these structures 191 180 CARPENTRY are domical in shape they are not, strictly speaking, domes, becausethey do not depend for support upon the same principle which isimplied in the construction of a dome. They are, correctly speak-ing, arrangements of trusses of such a shape as to give the requireddomical form to the exterior of the roof. Fig. 251 shows such a truss supported at either end on a masonrywall. Fig. 252, which is a plan of the framing of this roof, shows. Fig. 252. Plan of Framing for Dome Shown in Section in Fig. 251 how the sections or bents may be arranged. There are two completebents, A B and C D, like the one shown in the elevation. Fig. 251,which intersect each other at the center. A king-post A in theelevation is common to both bents and the tie-beams B are halvedtogether where they cross. These two bents divide the roof surfaceinto four quarters, which are filled in by shorter ribs, as indicatedin the plan, Fig. 252. The posts C, in Fig. 251, carry all the weightof the roof to the walls and are braced by means of the pieces D. 192 CARPENTRY 181 The rounded shape is given to the exterior and interior of the bentby pieces of plank bent into position as shown. The whole is coveredwith boarding which is cut to a special shape so that it can be bentinto place. The methods of applying the boarding to domical roofswill be explained in connection with o
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