Tebruary, '15] DEAN AND NABOURS: AIR COXDITIOXIXG APPARATUS 109 



perature of the air leaving the washer, and its expansion or con- 

 traction is caused entirely by this temperature, and the variation 

 due to its expansion is made to regulate this temperature. The water 

 heater of the ejector type shown at N is placed in the suction line 

 to the pump. The heater operates like a barometric condenser, so 

 that the temperature of the spray water is varied by varying the 

 amount of steam furnished to the ejector. 



The diaphragm steam valve shown at 0 (Plate 1) is placed in the 

 steam line which supplies the water heater. The valve is operated 

 by compressed air from the graduated thermostat. 



The air compressor shown at P (Plate 2) furnishes compressed air 

 to the storage tank Q (Plate 1) at about fifteen pounds pressure. 

 The compressor is driven by the same steam turbine L, that drives 

 the air suction fan K. 



The reverse acting diaphragm valve sho\Mi at R (Plate 1) is nor- 

 mally closed, but is opened b}^ compressed air from the tank, passing 

 through the safety valve S. 



This method of control is extremely sensitive, as any variation in 

 the air temperature passing over the stem of the graduated thermostat 

 produces a change in the air pressure on the diaphragm steam valve, 

 causing the valve to partially open or close, thereby producing a new 

 water temperature. In only a few seconds this water is sprayed into 

 the air, affecting its temperature, giving to it more or less heat in 

 accordance with the requirements of the thermostat. This air in 

 about one second passes over the thermostat stem, imparting to it 

 the change in temperature. 



The air then passes to the tempering or heating chamber T (Plate 1) 

 to be heated sufficiently to maintain the required temperature and 

 moisture. The heating chamber consists of six double-section steam 

 radiators of the vento type, each having a radiating surface of sixteen 

 square feet. The radiators are so constructed and so arranged as to 

 distribute \and heat the air uniformly before it flows into the breeding 

 chamber. One or more or all six of the radiators may be used in 

 accordance with the requirements of the air. The steam entering the 

 radiators is automatically controlled by the graduated thermostat 

 shown at U (Plate 2), placed in the breeding chamber. The entering 

 air is evenly distributed in the chamber aod flows over the stem of the 

 thermostat. The expansion or contraction of the thermostat is caused 

 entirely by this temperature and the variation due to its expansion is 

 made to regulate this temperature. The diaphragm steam valve 

 shown at V (Plate 2) placed in the steam line W that supplies the 

 steam for the radiators, is operated by compressed air from the gradu- 

 ated thermostat in the breeding chamber. The thermostat produces 



