. A domestic cyclopædia of practical information ... too, the temperature ofthe atmosphere outside of the building actsupon the air-vessel (B) in the cold-air box,making the draft-valve less sensitive to theheat in cold weather, and more sensitive inwarm weather. 3. The amount of heat produced will be inexact proportion to the demand for hot air inthe rooms above. Thus, if the registers are 37 partially closed, the hot air is kept back in thehot-air chamber, it acts upon the hot-air ves-sel (A), causing the draft-valve (F) to close,thus checking the fire and reducing the amountof heat obtained
. A domestic cyclopædia of practical information ... too, the temperature ofthe atmosphere outside of the building actsupon the air-vessel (B) in the cold-air box,making the draft-valve less sensitive to theheat in cold weather, and more sensitive inwarm weather. 3. The amount of heat produced will be inexact proportion to the demand for hot air inthe rooms above. Thus, if the registers are 37 partially closed, the hot air is kept back in thehot-air chamber, it acts upon the hot-air ves-sel (A), causing the draft-valve (F) to close,thus checking the fire and reducing the amountof heat obtained. The fire in the furnace isregulated without going into the cellar. Aneven temperature is always obtained in therooms warmed, irrespective of the state of theexternal atmosphere, and it is impossible toget an intense heat in the hot-air chamberwhen the registers are all closed. 4. The consumption of fuel will always begoverned by the amount of heat required. Ifthe weather is warm, the self-acting gover-nor closes the draft, checks the combustion,. Fig. I.— View of Governor, and saves the fuel. Without the governorit is very difficult and practically impossible toregulate the draft so as to prevent a great wasteof fuel, and an overheating of the house whenthe weather is mild. 5. Though the governor is self-actingand regulated by the temperature of theatmosphere, the draft valve can be closed oropened by the weight (K). By moving theweight to the right or left, as the case may or less heat will be obtained. 6. By the use of the self-acting governorthere will always be a strong atmosphericpressure inwards into the fire-pot. Thus,the smoke-pipe being always open, the escapeof smoke and gases into the hot-air chamberis impossible, however loose the joints of thefire-pot may be, and however defective may be 578 WARMING-PAN WASHING the castings. The combustion is regulatedupon the air-tight principle, the lower door ofthe furnace being air-tight, and just air eno
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