. Official proceedings . 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 TRACT
. Official proceedings . 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 Showing general details of sectional firebox. In the foregoing. I have endeavored to point out some ofthe more important factors which must be considered in theeconomical proportioning of a locomotive boiler. There havenaturally been a great many developments in the perfection ofdetails and in the application of special devices in connectionwith boiler designing many of which are important factors inthe service given. 53
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