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stations of this class charge the horsepower output with all the coal used by the engine, pumps, condensers, well pumps, cleaning fires, blowing-off boilers, etc., and where the former item is about three pounds of coal per horse power per hour, we have in the latter case, making no allowance for the engine running empty, a result fifty per cent, greater than this. Economy in this line, however, is not going to stop at compound engines, as there are being built by at least two manufacturers, triple expansion high-speed engines. (Mr. Field here showed views of such an engine, imported from France by Mr. Edison.)
Something similar to this is what we may obtain to-day, if encouragement is offered, from such engine manufacturers as Armington & Sons, Ball Engine Company, Mclntosh & Seymour and others. We are coming to a recognition of the fact that if we want the high economy we can obtain it as cheaply and as well, not to say more cheaply and better, with an engine of this class as with engines
