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84 in such buildings one can never know what changes in the arrangement of rooms or in the location of radiators may ultimately be desired. Figure 37 shows the typical floor plan of the heating diagrams for a fourteen-story building in Chicago, showing the location of risers and radiators. This building is exceptional on account of the large number of bay windows and large amount of glass surface. Furthermore, the risers were all concealed in the columns in the manner shown in Figures 38 and 39, the building being framed with Gray columns, built as indicated. An expan-

Figure 37.—Plan Showing Location of Risers and Radiators.

sion joint was placed on each riser, above the radiator connection at the eighth floor, with flange unions above and below the joint. At these joints a removable wooden panel was placed over each riser, as indicated at Figure 38, but otherwise they were enclosed by the wire-lath and plaster forming the ordinary finish of the columns. Figure 39 shows a section of the column at the fourteenth floor. The radiator connections were exposed above the floor and run about as indicated on the floor plan. This building is heated on the one-pipe overhead system. It contains 11,000 square feet of radiation, supplied by an 8-inch main to the attic. The typical floor has 1,055 square feet of glass surface, 2,025