ON RAIL-ROADS.

§25

tiers, steam 4^lb. per square inch above thepressure of the atmosphere, rope 7 \ inchescircumference, same as Experiment XX ; planethe same also; length 2325 feet, height orascent 115 feet, carriages same as precedingexperiment.

Time of drawing 7 loaded carriages 550seconds, making 320 single strokes of thepiston, 5 feet each.

This engine, by an additional rope attachedto the end of the above-named train of car-riages, also dragged, at the same time, 7loaded carriages, of the same weight, up ano-ther plane in extension of the other; length770 yards, and height 25 feet 6 inches.

Then (30 X 2) ! X • 7854 =: 1413.72, .area of cylinders X 19 • 5the pressure of the steam ~ 27567 lbs. pressure on the piston,which, in the experiment, was moved through 320 X 5- 1600feet.

Therefore, 27567 X 1600 = 44107200 lbs. moved one foot, theimpelling power of the engine.

_ 1380

Then G = f»40S x 7 x ^900 = 3204 lbs "

_ 25 5

G = 9408 X 7 X 2 ^ = 7261b?.

And, by Experiment V. F “ 43 x 14 -zz 602 lbs.

Also, by Experiment XX. <p =470lbs.

And, by another experiment, not here detailed, 127 lbs.

W S

Also - — 31 lbs. force required to overcome the inertia*.

r t 2

, , WS

And -- = 31.

rt‘

P