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weather with a moderate fire, will heat it comfort- 

 ably. In cold weather it takes a larger fire to heat 

 it, and in extremely cold weather the hottest fire 

 we can make in this stove will not heat it properly. 

 Why ? Because the outside temperature penetrates 

 the thin wall. If this same room was to be heated 

 for chicks, the chicks to run on the floor, and you 

 wanted the temperature on the floor at 70, would 

 you for a moment think of putting the regulator at 

 the ceiling and calculating the temperature below ? 



THERMOSTATS. 



Air, water, alcohol, ether, iodine, kerosene, 

 mercury, gold, silver, iron, steel, brass, rubber and 

 many other substances have been used in making 

 thermostats, with varying success. A thermostat 

 combining the right quality of vulcanized rubber 

 with a grade of brass made suitable for this purpose, 

 is the best one yet made. It took years of experi- 

 ment to determine the exact quality and grade, 

 and it requires an expert to put them together so 

 they will work true and correctly, and neither lose 

 power nor take a back or reverse action. 



A thermostat may work near enough to control 

 the heat of a furnace or to ventilate a house, and 

 yet fail to give satisfaction on an incubator ; for a 

 very small variation of the thermostat may ruin 

 the entire hatch. 



Each year some manufacturer of metal goods, 

 agricultural implements, show cases, washing 



