. Official proceedings . adbeen laid down and were being very generally observed. These facts had to do with various features of boiler design,heating surfaces, cylinder proportions, etc., many of which hadbeen w^orked out by actual tests under working conditions. In 1830 Stephenson found that in a locomotive boiler, opento the atmosphere, and with the firebox separated by a platefrom the barrel, that one foot of firebox was equivalent to threeof tube surface. In 1840 Dewrance modified the experimentsbv dividing the barrel of a small locomotive boiler into sixcompartments that next the firebox
. Official proceedings . adbeen laid down and were being very generally observed. These facts had to do with various features of boiler design,heating surfaces, cylinder proportions, etc., many of which hadbeen w^orked out by actual tests under working conditions. In 1830 Stephenson found that in a locomotive boiler, opento the atmosphere, and with the firebox separated by a platefrom the barrel, that one foot of firebox was equivalent to threeof tube surface. In 1840 Dewrance modified the experimentsbv dividing the barrel of a small locomotive boiler into sixcompartments that next the firebox being 6 inches long, and theremaining five compartments each 12 inches long. The resultsshowed that the first six inches of tube were equal, area for area,to the firebox surface; the second compartment was only about 42 one-third as effective, while in the reniainini:;- four compartmentstlie evaporation was so small, accordini^ to the experiments, asto be practically useless. Water Evaporated peb Hour with LBS. Diagram of boiler used in Petiet tests, 1865, showing water evaporated per hour in each section of the boiler. In 1858 C. W. Williams experimneted on a small opentopped boiler, 4 feet 6 inches long-, having- a 3 inch tube passing-through it. The boiler was divided into five compartments, thefirst being 6 inches and the others 12 inches in length. Theheat w^as supplied by means of a gas burner in one end of thetube, bent down at a right angle. In a trial of four hours thewater evaporated from 44 degrees was in the five compartmentsrespectively 96, 44, 24, 19 and 16 ounces, and although thetemperature of the escaping products of combustion was about500 degrees, that of the water in the last compartment was only170 degrees.
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Keywords: ., bookauthorrailwayc, bookcentury1900, bookdecade1900, bookyear1901
