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COMMERCIAL POULTRY RAISING 



the tracks for the egg trays. The door should fit snugly, but it 

 must open and close easily, without jarring, which will tend to 

 throw the regulator out of adjustment, and the machine out of 

 plumb. If the doors stick, which they are likely to do with the 

 first hatch, plane them down a bit, or rub the edges with sand- 

 paper. If the trays do not run smoothly, plane them also, and 

 then rub the bearing edges with soapstone, or some other sub- 

 stance that will reduce friction. Do not use oil. 



(Courtesy Newton Giant Incubator Company) 



Fig. 152. — 9,600-egg double deck coal-burning incubator. Note handles at 

 end of machine which operate the egg-turning mechanism. 



In selecting a machine here are a few pointers: The size to buy 

 will depend upon circumstances, of course, but it should be 

 borne in mind that it does not take any more time to care for 

 the heating device on a 400-egg machine than it does for a 6o-egg 

 machine. And in most cases the fuel cost per egg is reduced with 

 the increased capacity of the machine. Furthermore, the larger 

 the machine the less likelihood there is for a variation in the 

 temperature. 



