takes away the SUPPLY of heat from the heater 

 and PRE VENTS the heater from overheating the 

 egg chamber at any time. See Hot-air Incubator J\ 

 Again, other makers decry our lamp trips, saying, 

 'They are unreliable' [Not only unreliable, but 

 dangerous, from their inclination to clog and stick, 

 causing smoke, overheat, etc^\ when this is the 

 safest and surest part of the whole thing, \_At par 

 with the other details. ~\ as it is nothing more or less 

 than an adjustable wick tube to reduce the flame. 

 Instead of turning down the flame, the tube is 

 drawn up over it the action different, but the 

 result the same." 



TWO REGULATORS. 



Some incubators have two regulators. Why ? 

 Because one is not sufficient. The regulator which 

 raises and lowers the flame of the lamp does not 

 entirely control the heat, especially when the tem- 

 perature of the room rises. To remedy this diffi- 

 culty a second regulator is added, one to open and 

 close a valve in the egg chamber. As we have 

 used such machines, we will tell you how they 

 worked for us, and you can decide whether or not 

 two regulators are an advantage. 



For instance we set the lamp trip regulator to 

 lower the flame at 103^ and the egg chamber 

 ventilator to open at 104^ both thermostats 

 being in ^the egg chamber. The temperature of 

 the room in which the incubator is operated is 55 

 at 7 o'clock A. M. We have filled and trimmed 

 98 



