294

MOTIVE POWER EMPLOYED

it is pumped into the boiler as occasion requires.In the detail of the Experiments I have notnoticed the fuel required to heat the water, asI considered, that where economy of fuel wasan object, the water would be heated byother means, either by throwing the steamescaping from the cylinder amongst the water,or by husbanding some of the radiation,which takes place unnecessarily on so manyparts of the machine. Nothing is wanted todestroy the noise, than to cause the steam toexpand itself into a reservoir, and then allow itto escape gradually to the atmosphere throughthe chimney. Upon the Wylam Rail-road thenoise was made the object of complaint by aneighbouring gentleman, and they adoptedthis mode, which had the effect above-men-tioned. S, Fig. I. Plate VI. of that engine,will shew the reservoir into which the steamis allowed to enter, after it leaves the cylinderC ; the steam there expands itself, and thenissues through the pipe r, into the chimney,without that noise made by the others. Innu-merable methods of preventing the noise andheating the water might be suggested; onepipe within another, placed around the frameon which the boiler rests, the interior onecontaining the water, and the steam beingmade to pass from one end to the other withinthe outer one, aud in contact with the exterior