. Cyclopedia of architecture, carpentry, and building; a general reference work ... feet without any keys. Balconies and Galleries. In churches and lecture halls it isalmost always customary to have one or more balconies or galleries,extending sometimes around three sides of the main auditorium. 174 CARPENTRY lb3 but more often in the rear of the room only. These galleries aresupported by the wall at the back and by posts or columns in front,and the framing for them is usually a simple matter. Fig. 233 shows a sectional view of a gallery frame, as they arecommonly constructed. There is a girde
. Cyclopedia of architecture, carpentry, and building; a general reference work ... feet without any keys. Balconies and Galleries. In churches and lecture halls it isalmost always customary to have one or more balconies or galleries,extending sometimes around three sides of the main auditorium. 174 CARPENTRY lb3 but more often in the rear of the room only. These galleries aresupported by the wall at the back and by posts or columns in front,and the framing for them is usually a simple matter. Fig. 233 shows a sectional view of a gallery frame, as they arecommonly constructed. There is a girder A in front, which restson top of the columns T, and supports the lower ends of the joists B,forming the gallery floor. The size of these pieces will depend uponthe dimensions of the gallery, the spacing of the columns whichsupport the girders in front, and various other posts 2X10 or 3X12, and girders 8X10 or lOX 12 will befound to be sufficiently strong. The joists should be spaced from14 to 20 inches, center to center. Very often cast-iron columns are. Fig. 233. Sectional View of Gallery Framing employed to support the girders. At the top, where the joists reston the wall, they should be cut, as shown in the figure, so that theymay have a horizontal bearing on the masonry, and at least everysecond joist must be securely anchored to the wall, as is the oneshown. Usually galleries are made with straight fronts, but if it isdesired that the seats should be arranged in concentric rings, allfacing the speaker, the joists may be placed so as to radiate from thecenter from which the seats are to be laid out. The seats are arranged in steps, one above the other, and theframing for the steps must be built up on top of the joists, as shownin the figure. Horizontal pieces C, usually 2X4 or 3X4 in size, arenailed to the joists at one end, and at the other end they are supportedby upright pieces D. The uprights are either 2X4 pieces restingon top of the joists, or
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