. The principles of ventilation and heating and their practical application. Figure 70.—SWITCH VALVE RECOMMENDED BY DR. N. FOLSOM. 212 VENTILATION AND HEATING. the wards, and be made warmer, or it may be passed direct into thewards, or any mixture of the air at the two temperatures may be passedin, but by no means can the air supply be reduced. It is a circularregister to all outward appearance, and is connected with a sheet-irontube, which goes through the floor. This tube is divided its wholelength by a septum, so as to form two semi-circular tubes. One of. Figure 71.—DETAIL OF MIXING VALVE.
. The principles of ventilation and heating and their practical application. Figure 70.—SWITCH VALVE RECOMMENDED BY DR. N. FOLSOM. 212 VENTILATION AND HEATING. the wards, and be made warmer, or it may be passed direct into thewards, or any mixture of the air at the two temperatures may be passedin, but by no means can the air supply be reduced. It is a circularregister to all outward appearance, and is connected with a sheet-irontube, which goes through the floor. This tube is divided its wholelength by a septum, so as to form two semi-circular tubes. One of. Figure 71.—DETAIL OF MIXING VALVE. these halves is connected to the supplementary-coil chamber, and has astopper at the bottom, while the other half is open. The register,instead of having valves in the ordinary way, has a solid semi-circulardisk, which can be revolved under the fretwork by a key introducedinto the slot in the middle, as shown. This semi-circular disk may beturned so as to close one or other of the semi-circular pipes, or it may VENTILATION AND HEATING. 213 be made to cover one-half of each, so that one-quarter of the fretworkis delivering air at 60 degrees, while another quarter is at120 degrees, or any other proportions of the two currents may beobtained by shifting the position of the semi-circular disk without reduc-ing the volume.
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Keywords: ., bookcentury1800, bookdecade1880, booksubj, booksubjectventilation
