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21 Prof. Carpenter's Arrangement for Testing Radiators.

not get as high as that of the radiators, small openings were made in each at the bottom and top. In 1895 and 1896 the author had occasion to make comparative tests of a large number of radiators of various kinds and types, and the arrangement used by him for testing is shown in Figures 23 to 25. The two test rooms were built in the main floor of a large warehouse, and each was 15 feet by 11 feet 8 inches, and extended to the ceiling, 15 feet 5 inches high. The walls of the test rooms were built of matched and beaded pine and lined with lapped courses of heavy building paper. The warehouse room in which the test rooms were located was about 85 by 50 feet, with brick walls on both sides and wood and glass partitions at each end. Neither end of this large room, however, was open to the outside air and the side walls were party walls. Every effort was made to keep the air of the test rooms free from all drafts except those induced by the column of hot air rising from the radiators and to otherwise make the conditions as nearly as possible those of actual practice. To permit some circulation in the test room, so that the air would not get too hot, an opening 4 inches long and 18 inches high was cut in the front