 | American School (Chicago, Ill.) - 1903 - 380 стор.
...proceed in the same manner as in the case Fig. 36. of a furnace. For the best types we may assume a combustion of 5 pounds of coal per square foot of grate per hour, and an average efficiency of 60 per cent, which corresponds to 8,000 BTU per pound of coal, available for... | |
 | American School (Chicago, Ill.) - 1906 - 588 стор.
...proceed in the same manner as in the case Fig. 36. of a furnace. For the best types we may assume a combustion of 5 pounds of coal per square foot of grate per hour, and an average efficiency of 60 per cent, which corresponds to 8,000 BTU per pound of coal, available for... | |
 | American School (Lansing, Ill.) - 1907 - 424 стор.
...good anthracite coal will give off about 13000 BTU and a good furnace should utilize 70 per :x>nt. of this heat. The efficiency of an ordinary furnace...draft we may safely count upon a maximum combustion of o pounds of coal per square foot of grate per hour, and may assume that 8000 BT U; will be utilized... | |
 | American School of Correspondence, Chicago, Charles Lincoln Hubbard - 1908 - 252 стор.
...same manner as in the case of a furnace. For the best types of househeating boilers, we may assume a combustion of 5 pounds of coal per square foot of grate per hour, and an average efficiency of 60 per cent, which corresponds to S,(M)() BTU per pound of coal, available... | |
 | Louis Derr - 1909 - 460 стор.
...cold weather a rate of 4 to 5 pounds of coal per square foot of grate per hour must be main^ tained. One pound of good anthracite coal will give off about...foot of grate per hour, and may assume that 8,000 BT I", will be utilized for warming purposes from each pound burned. This quantity corresponds to an... | |
 | 1909 - 444 стор.
...same manner as in the case of a furnace. For the best types of househeating boilers, we may assume a combustion of 5 pounds of coal per square foot of grate per hour, and an average efficiency of 60 per cent, which corresponds to 8,000 13. -TU per pound of coal, available... | |
 | 1909 - 500 стор.
...same manner as in the case of a furnace. For the best types of househeating Imilers, we may assume a combustion of 5 pounds of coal per square foot of grate per hour, and an average efficiency of 60 per cent, which corresponds to 8,(KKl BTU per pound of coal, available... | |
 | 1918 - 386 стор.
...same manner as in the case of a furnace. For the best types of househeating boilers, we may assume a combustion of 5 pounds of coal per square foot of grate per hour, and an average efficiency of 60 per cent, which corresponds to 8,000 BTU per pound of coal, available for... | |
 | 1919 - 524 стор.
...same manner as in the case of a furnace. For the best types of househeating boilers, we may assume a combustion of 5 pounds of coal per square foot of grate per hour, and an average efficiency of 60 per cent, which corresponds to 8,000 BTU per pound of coal, available for... | |
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For the best types of househeating boilers, we may assume a combustion of 5 pounds of coal per square foot of grate per hour, and an average efficiency of 60 per cent, which corresponds to 8,000 BTU per pound of coal, available for useful work. In the... 
