. Official proceedings . Chart in which sizes cf objects represent comparative rates ofcombustion in pounds per sq. ft. cf grate per hour. changed in the same engine, with all the other elements remain-ing constant. In each of three separate tests, 4000 pounds ofcoal were fired per hour, but the grate area in the first case was55/^ square feet. In the other two, a part of the front grateswas blanked, so that the grate area was first reduced to 39/^and then to square feet. The combustion rates were, there- 51. 1500 1400 1200 ICOO 800 600 400 1X)0 DilTerence in Dcg. in Tube
. Official proceedings . Chart in which sizes cf objects represent comparative rates ofcombustion in pounds per sq. ft. cf grate per hour. changed in the same engine, with all the other elements remain-ing constant. In each of three separate tests, 4000 pounds ofcoal were fired per hour, but the grate area in the first case was55/^ square feet. In the other two, a part of the front grateswas blanked, so that the grate area was first reduced to 39/^and then to square feet. The combustion rates were, there- 51. 1500 1400 1200 ICOO 800 600 400 1X)0 DilTerence in Dcg. in Tube and Gases Curves showing the amounts of heat transmitted per hour by radia-tion, ccnvecticn, and the sum of the two for various differences intemperature between water and hot gas or fire. fore, respectively. 72,101 and 134 pounds per square feet ofgTate area per hour, and yet the boiler efficiency was practicallyunchanged ; the reason being that in these three tests practically 52 the same (^i)])i>i tiinity tor complete conibuslini was j^iveii PIAGHAM OF LOCOMOTIVE IIAVINO GREATER TRACTIVE lOWER TIIAV ASV EVCIVE EVER 9WLT M r^^Ei-^t^r—d^ fy^^ ERIES NEW SIXCVLIXDER ARTICULATED MALLET COMPOUND LOCOMOTIVE MATT H SHAV irrespective of the rate at which coal was fired per sfpiare footof grate area. Mr. L. H. Fry. in cominenting;- on these tests, says: Itappears from these tests, that the efficiency of the absorption ofheat is practically independent of the rate of combustion andevaporation.
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