Incubation. — Part I 



1379 



Felts and diaphragms. — Several types of machines have felts or burlap 

 diaphragms in the bottom. The operator should be sure that these are 

 arranged properly before imdertaking to heat the machine. To remove 

 these felts or dia- 

 phragms while eggs are 

 being incubated, ex- 

 cept as advised by the 

 makers, would greatly 

 lessen the hatching 

 power of the incubator 

 in most cases. 



Thermometer. -When 

 the machine is in op- 

 eration the thermo- 

 meter should be kept 

 in the place designat- 

 ed by the incubator 

 manufacturers, N o 



other make of thermometer than the one recommended by the incu- 

 bator company should be used. The most common types are the contact, 

 the standing, and the hanging thermometer (see Fig. 23). 



Testing thermometers. — A new thennometer should be tested before 

 using; an old one should be tested each season. To test successfully, a 



Fig. 22. — Parts of heater, i, Screen; 2, fume exit; 3 (belcw 

 2), fresh air entrance; 4 {below j), metal cap; 5, asbestos 

 jacket 



Fig. 23. — Several styles of thermometers, i and 2, Hanging; j and 4, contact; 5 and 



6, standing 



physician's clinical thermometer should be used, or any standard ther- 

 mometer that registers correctly between 100° and 110° F. The two 

 bulbs should be dipped together in water registering about 100° F. If 



