the moisture pans and the amount of evaporating 

 surface required. The time and quantity are 

 figured out for your location and incorporated in 

 the general directions sent by the manufacturer of 

 a good incubator, but as he cannot know the 

 exact kind, quality and condition of the eggs you 

 may use, his directions are given for the best 

 results from an average lot of mixed eggs and an 

 average condition of outside temperature and 

 humidity. 



Here is the record of a little experiment, using 

 the wet and dry bulb hygrometer and a spiral 

 moisture gauge in the incubator room, and two 

 spiral moisture gauges inside the incubator, the 

 temperature of the egg chamber being 103 the 

 spiral instruments all being compared and set by 

 the wet and dry bulb hygrometer, to within one- 

 fifth of a degree, or as near as possible with such 

 instruments : First day, in room, dry bulb 79 

 wet 71 spiral 30 ; inside of incubator, No. i, 60 

 No. 2, 90. Second day, room, dry 70 wet 

 76 spiral 100 ; in incubator, No. i, 95 No. 2, 

 65 ; Afternoon of same day, room, dry 70 wet 

 76 spiral 85 ; in incubator, No. i, 60 No. 2, 

 95. Third day, room, dry, 75 wet 72 spiral, 

 95 ; in incubator, No. I, 100 No. 2 index 

 against 100, and did not start back until No. i 

 reached 75. The same degree of heat, same ven- 

 tilation and same exposure of water surface were 

 kept in the incubator all three days. We have 

 kept these and other tests going for years, but 

 have given enough to illustrate the point without 

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