22 POTJLTKY LABORATORY GUIDE 



per dozen. This will be much greater if the in- 

 cubator room is an individual building by itself 

 than if it is located in the cellar or room of 

 another building. 



An economical and efficient building can be 

 constructed for from ninety cents to one dollar 

 per dozen eggs, not including labor. 



Figure the cubic feet of air space and determine 

 the volume per dozen eggs. The amount of air 

 space required depends on the system of ventila^ 

 tion. A good safe figure is about ten to twelve 

 cubic feet for each dozen eggs. 



EXERCISE VII 



A Study of the Incubator 



Carefully examine all parts of each incu- 

 bator, beginning with the general appearance of 

 the entire machine. It should be built of well- 

 seasoned lumber, be well put together, and should 

 also be substantial looking. It should have a 

 good smooth finish both for looks and durability. 



See that the machine is perfectly level. Why ? 

 Note the size of the legs and the method of at- 

 taching them to the incubator. Are they easily 

 removed for shipment or not? By placing the 

 hand on the front edge of the incubator see if it 

 is squarely and firmly resting on all four legs. If 



