Grade. 

 Date.. 



EXERCISE 23 

 THE INCUBATOR— LOCATION, CONSTRUCTION, AND OPERATION 



Whenever possible each student should run one machine for an entire 

 hatch in addition to performing this exercise. 



Object. — To become familiar with the various types and sizes of incu- 

 bators, to determine the principles of heat distribution and control and to 

 become familiar with the details of operation. 



Equipment. — As many representative types of incubators as it is possi- 

 ble to secure; include, if possible, mammoth and individual machines, of both 

 hot air and hot water types. 



Procedure. — Step 1. — Make a list of all machines to be studied, re- 

 cording name, size, cost, and method of heat distribution (air or water). 



Step 2. — Examine each machine, noting its external appearance, apparent 

 durability, finish, material, and design. 



Step 3. — Open the machine and examine interior construction, learning 

 name and arrangement of parts. 



Step 4. — Examine the source of heat, whether lamp or stove. Trace the 

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