Stationary steam engines, simple and compound; especially as adapted to light and power plants . ection of regulationattainable by these positive motion valve-gears attached tothis form of governor, to which attention has already beencalled. At a trial of engines of this make made by theauthor, to satisfy himself in regard to their action undervarying load, 25, 50, and sometimes 60 Thomson-Houstonarc lights were thrown on or off, and the variation of speedwas but one and two revolutions, respectively, in 280. Nospecial preparation or adjustment was allowed in this case,and there is no reason t
Stationary steam engines, simple and compound; especially as adapted to light and power plants . ection of regulationattainable by these positive motion valve-gears attached tothis form of governor, to which attention has already beencalled. At a trial of engines of this make made by theauthor, to satisfy himself in regard to their action undervarying load, 25, 50, and sometimes 60 Thomson-Houstonarc lights were thrown on or off, and the variation of speedwas but one and two revolutions, respectively, in 280. Nospecial preparation or adjustment was allowed in this case,and there is no reason to doubt that still closer regulationand more perfect isochronism are attainable, if they, at anyfuture time, should prove to be desirable. These engines,9/^ by 12 inch cylinders, had never been before tested, andhad done no work until started under the direction of theauthor. The lamps demanded very exactly horse-powereach, a fact which indicates that, as connection is theremade, there can be but little lost power between the engineand the lamp. The form of card under load is seen Diagram Taken from A. & S. Engine. 134 STEAM ENGINES FOR The success here obtained in the use of a single valve isas encouraging as it is remarkable. While it can hardly beexpected that the economy of this system, other things be-ing equal, can be fully up to that obtainable with the moreelaborate forms of valve-gear previously illustrated, there isno question that it is so great that these simple forms ofengines will be able to find a market in that very wide fieldin which their extreme simplicity of mechanism and theirmoderate cost, as well as their successful operation at highspeeds, are qualities which compensate any such differ-ences in cost of the steam supply. If the same distributionof steam, and the same economy is obtained with the oneform of valve motion as with the other, and if, as is thecase to a very satisfactory degree with these engines, a cor-rect form of indicator diagra
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectsteamen, bookyear1902
