. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. These are all ventilated by means of a large central chimney, 7 feet in inside diameter and 118 feet high, vrhich receives the hot air from the fnrnoces of the steam-boilers, and, when needed, additional heat from a separate firo. ^long the outer face of the side-walls of each building extends a subterranean passage-way of masonry, (cc, Figs. 21, 22,) 2 feet square, leading to the ft^^^ base of the chimney. Wher- ever the phosphorus is plac
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. These are all ventilated by means of a large central chimney, 7 feet in inside diameter and 118 feet high, vrhich receives the hot air from the fnrnoces of the steam-boilers, and, when needed, additional heat from a separate firo. ^long the outer face of the side-walls of each building extends a subterranean passage-way of masonry, (cc, Figs. 21, 22,) 2 feet square, leading to the ft^^^ base of the chimney. Wher- ever the phosphorus is placed, an opening is made either in the walls or in the floor, communicating by a small pipe with the under- ground passage so as to carry off the injurious va- pors without allowing them to spread in the shop. Special arrangements differ according to the nature of the work. Thus, where the tips are prepared, a wide and shallow funnel is used, in which the draught is increased by the flames of the melting-fire. The shop for the dipping and drying operations, which are the most dangerous, is particularly well ventilated. The general arrangement is shown in the two figures, (21,22.) The build- ing is GG feet by 49 feet. Along the two sides are placed the dry- ing-chambers E E E, 18 in num- ber, each being G feet wide, IG feet deep, and 7 feet high to the spring of the ceiling-arch, and 9 feet to the crown. They are con- nected with the ventilating-tun- nel c c by a triple row of open- ings, o, 0,0,10 inchesby 5 inches, at the floor-level, and receive the external air either by chimneys extending above the roof or by openings, 9 inches by G inches, placed at the bottom of the iron doors of the drying-rooms, and taking air from the main hall. The doors are G feet high and nearly 3 feet wide. The drying-rooms are heated by three rows of 2-inch steam-inpes placed under the floor. The channels in which these jjipes are placed should receive cold air to be carried directl}' into the dryin
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