114 POULTRY LABORATORY GUIDE 



Should the water ever go over 212 degrees, 

 steam will be formed and it will be necessary to 

 at once lower the temperature of the water, and 

 this can most quickly be accomphshed by stop- 

 ping all draft and banking the fire. Whenever 

 steam forms, it is necessary to immediately open 

 the pet cocks in each coil to allow the same to 

 escape. 



Hard coal makes the best fuel; soft coal will, 

 however, give satisfactory results, but it will re- 

 quire much more attention. With hard coal the 

 fire should rarely be poked from above, all pok- 

 ing being done from below; with soft coal the 

 reverse is the rule. 



Take care to keep all ashes removed from the 

 ash pit, since if allowed to accumulate in great 

 numbers they will burn the grate out as well as 

 spoil the draft. 



Be sure at all times that there is an abimdance 

 of water in the system. If for any reason it 

 should get very low, do not admit" more inamedi- 

 ately, but bank or draw out the fire and allow the 

 boUer to cool off before letting in cold water; 

 if this precaution is not followed, a cracked heater 

 will be the result. 



