TRANSACTIONS OF SECTION G. 



887 



Jersey, makes regularly the run between Jersey City and Bound Brook, thirty-two 

 miles, in thirty-seven minutes, at the rate of 52-16 miles per hour, and has made it in 

 33 minutes, 58-2 miles per hour ; and has run three miles of the route in 2 minutes 

 24 - 5 seconds — 74-74 miles per hour. She has run a single mile in 45 seconds — 80 

 miles per hour. A test of a locomotive by John W. Hill is given in a manner 

 which hardly admits of condensation. The train resistance, on a level, appears 



/ 1 ■> 

 to be about 67 pounds per ton ( ooa.q ) • Feed-water evaporated per indicated 



horse-power, per hour, 32-28, 33-40, and 31 -96 pounds — mean, 32 - 55 — which, with 

 the reasonable evaporative duty of nine pounds of water per pound of coal, should 

 have been done with 3-62 pounds of coal per i.h.p. per hour. In fact, the coal 

 was 4 - 24, 7 -03, and 5*36 pounds — mean, 5 - 54 pounds — per i.h.p. per hour, and the 

 evaporation during the middle run fell as low as 451 pounds of water per pound 

 of coal. This shows clearly the deficient fire-grate area already noticed. The 

 water given above includes all that was blown off at the safety-valve, and used at 

 the whistle and gauge-cocks, and in experiments with a calorimeter. Allowing 

 for this, the consumption of water was 30-26 pounds per i.h.p. per hour. The fire- 

 grate-area was but 15-09 square feet, and the rate of combustion was at times as 

 high as 172 pounds per hour on each square foot of grate-area. With a grate 

 four-and-a-half times as large, such as might be obtained in a Wootten 

 engine, this rate would be reduced to 38 - 2 pounds, and might be still further 

 reduced, by increased economy, to as little as 20 pounds per square foot and per 

 hour. 



Some points of locomotive practice are then given. Locomotive No. 137, on 

 the Boston and Albany Railroad, ran 436 days out of 438 (with the loss of only 

 two days by some slight accident), 198L1 miles per day of actual service, 87,190 

 miles in all, at the rate of 72,192 miles per annum, and was then repaired, 

 including painting and varnishing, in four days, and resumed her regular 

 service. 



The locomotive ' Pacific,' built by the shop of which the writer was superin- 

 tendent, was placed in service on the Boston and Maine Railroad, March 16, 1855, 

 and ran regularly in passenger service to the close of 1883, 28 years 9h months, 

 and has since run 60 miles per day on gravel trains, making an aggregate mileage 

 of 904,255 miles — an average, for 29£ years, of 30,650 miles per annum. More 

 than one-half of the material originally put into her is in her still, and she is in 

 good working order. 



Three engines on the Hudson River Division of the New York Central and 

 Hudson River Railroad, have made a record of which the following table contains 

 the mean results. Mean weight of trains, 294 tons : — 



