EGGS IN COLD STORAGE. 61 



tion, and one which the writer has practiced, but it is 

 open to criticism, because of the fact that the air is 

 not purified fully at the same time it is cooled and 

 dried. If the air is first cooled to several degrees 

 below the temperature of the room to be ventilated, 

 it will be of benefit to the room, if not overdone, but 

 in results will not be equal to a system to be described 

 and illustrated further on in this article. 



Several houses known to the writer ventilate by inefficient 

 letting the warm outside air in at a high point of the 

 ceiling, directly over cooling coils, expecting that the 

 air will be properly cooled and dried before it flows 

 into the room itself. The same objections are appli- 

 cable to this system as are applicable to any plan of 

 ventilating where the air is cooled only to the tem- 

 perature of the room to be ventilated, because the 

 air will be at the saturation point, and will therefore 

 raise the humidity of the room, as well as introduce a 

 quantity of germs and impurities. 



If we ventilate by simply cooling the air, the sim P le air 



of . cooler. 



simplest and most effective method, as shown in 

 Fig. 9, is to take the air from as high and sheltered a 

 place as is accessible about the building; draw it 

 down over frozen surfaces in the form of brine or 

 ammonia pipes, which may be arranged anywhere 

 along the wall of a room, outside of the storage en- 

 tirely, if more convenient. An exhaust fan takes the 

 air from the coils in the ventilating flue and forces it 

 into the room to be ventilated, allowing it to escape in 

 the neighborhood of the cooling coils, where it will 

 mix with the air circulation, and flow into the room 

 through the regular channel. It is necessary to pro- 

 vide an outlet for the escape of foul air whenever 

 fresh air is forced into the room. This outlet should 

 be near the floor, and of about the same area as the 

 inlet pipe. A steam coil may be provided beneath 

 the cooling coil in ventilating flue, as shown in the 

 sketch, for the purpose of melting the frost off the 



