INCUBATION 21 
sible the maker’s directions for setting up the 
machine and for running it. It should, of 
course, first be leveled. If this is not done 
one corner may be higher than the others, 
with the result that the part that is higher 
will also be hotter and the eggs in various 
parts of the machine will not be getting the 
same degree of temperature. Some will be 
too hot and others will be too cold. 
Trying It Out. Whether the machine is 
new or second-hand, it should be run several 
days to see that it will run accurately. If a 
second-hand machine is used, care should be 
taken to see that the rod which connects the 
thermostat with the damper arm is per- 
fectly straight. If this is at all bent, the 
rod may bind as it passes through the little 
hole in the top of the machine and cause the 
damper arm to stay down, or it may lift the 
damper arm and hold it lifted, so that it will 
be impossible to run the temperature evenly. 
If the machine is run several days before 
placing the eggs in it, the operator will have 
a chance to find out whether all the parts are 
perfect. At least two days should be allowed 
for getting the machine warmed up. 
