POULTRY LABORATORY GUIDE 25 



Remove the cotton, felt, and cardboard used for 

 insulation purposes, and note how perfectly the 

 machine is protected from outside changes of 

 temperature. 



Examine carefully all ventilators, follow them 

 into the machine, and determine how the air is 

 made to circulate. Look for ventilators in the 

 bottom of the incubator; if absent, note the open 

 construction of the bottom. Note the presence 

 or absence of a drop-bottom which when down 

 leaves the entire bottom of the incubator open. 

 What is the advantage of this ? Are there any 

 special arrangements for supplying moisture to 

 the incubator; if not, how does the moisture get 

 to the eggs ? 



After the machine has been thoroughly in- 

 spected, replace all internal parts in their proper 

 positions, close the door, and leave the entire 

 machine in first-class condition for running. 



Note the position in which the machine is 

 placed with reference to danger from fire and 

 the probability of strong drafts of air blowing 

 directly upon it. 



Repeat these observations, using every differ- 

 ent make of incubators possible. 



