EGGS IN COLD STORAGE. 43 



II, page 23, it will be noted that an arbitrary 

 percentage is given for each temperature. These 

 are the most desirable percentages of air moisture 

 for average conditions of circulation, as when using 

 the most scientific forms of gravity air circulation 

 during warm weather. When using a good system 

 of forced circulation, these percentages may be in- 

 creased moderately. Exactly how much will depend 

 on conditions, and can be told only by trial, but it will 

 be much greater in proportion at the high tempera- 

 tures, ranging from 2 per cent or 3 per cent on the low, 

 to 7 per cent or 8 per cent on higher temperatures. 



Before taking up the forced circulation systems Electric fan in 



egg room not 



proper, the electric fans used in so many large houses desirable. 

 will be considered. These little fans are a four to 

 six-bladed disk fan, from twelve to eighteen inches in 

 diameter, attached directly to the shaft of a J/s or 

 ^ -horse power electric motor. /The wires supplying 

 the electric current to the motor are usually con- 

 nected to the socket for an ordinary incandescent 

 lamp. Electric fans are usually placed on the floor 

 in the back end of alleyway, or in an opening in the 

 piles of goods, creating a draft of air from one ex- 

 tremity of the room toward the other. As the air 

 from the fan will follow a path of least resistance, the 

 circulation resulting from their operation is largely 

 confined to the alleyways or openings in the piles of 

 stored goods it does not penetrate through and be- 

 hind the piles of eggs. It may be readily observed 

 that this is of doubtful utility, and may at times lead 

 to positive harm by causing a condensation of mois- 

 ture upon goods as a result of the comparatively 

 warm, moisture laden upper strata of air coming in 

 contact with the flow of cold air from the cooling 

 pipes. Electric fans have also been utilized to propel 

 the air from the cooling pipes, for which purpose they 

 are placed in an opening in a screen or mantle cover- 

 ing the pipes, forcing the cooled air outwardly into the 



