POULTRY LABORATORY GUIDE 65 



is promoted by diminishing the demand for heat 

 and energy. 



EXERCISE XIX 



Machine Fattening 



Select the birds to be fattened, and place them 

 one or two in each crate. The stall should be 

 made smaller than in crate fattening, about 

 sixteen by eighteen inches, and should be pro- 

 vided with a sliding door. 



Construct the crate with movable pans or shding 

 boards in the bottom. Why ? Place the coops 

 one above the other in a building which can be 

 darkened. 



Before attempting to feed the birds with the 

 machine, study its construction carefully, noting 

 the following parts and the work which each 

 part performs. Note the construction and shape 

 of the food chamber. What is its capacity? 

 Measure the diameter of the piston and the 

 length of the stroke. How much food does one 

 stroke of the piston force through the cylinder ? 

 Find the spring which brings the piston and foot 

 lever back into place. Examine the nozzle and 

 food tube ; how is it constructed so as not to in- 

 jure the bu-d's mouth or throat ? Find the stop 

 for regulating the amount of food, move it up and 



