Stationary steam engines, simple and compound; especially as adapted to electric lighting purposes . te the supplypipe to show the passages and valve-rods. These rods aredriven by the main eccentric, the steam valves directly, andthe exhaust through a rock-shaft. The cut-off valve isdriven by a separate eccentric, as in the preceding form ofengine, and this eccentric, like the preceding, is adjustablein position on the shaft by the governor. The engine isthus made automatic in its adjustment of the point of ELECTRIC LIGHTING PLANTS. 89 cut-off, and in regulation. Separate valves are seen at ea
Stationary steam engines, simple and compound; especially as adapted to electric lighting purposes . te the supplypipe to show the passages and valve-rods. These rods aredriven by the main eccentric, the steam valves directly, andthe exhaust through a rock-shaft. The cut-off valve isdriven by a separate eccentric, as in the preceding form ofengine, and this eccentric, like the preceding, is adjustablein position on the shaft by the governor. The engine isthus made automatic in its adjustment of the point of ELECTRIC LIGHTING PLANTS. 89 cut-off, and in regulation. Separate valves are seen at eachend of the cylinder, and the clearance and dead spaceis thus reduced to a minimum. This last provision makesit possible to cushion the exhaust steam up to boiler pres-sure on the return stroke, and thus to secure a minimumwaste by condensation on the opening of the steam valvefor the succeeding stroke. Cushioning is not here limited bythe steam side. The construction of the connecting rod,and the method of connection, are such that the wear of jour- O; 10; \o pi -- - (p O: Co & L~-vdit±Jo. Cylinder; Elevation and Section. nals and bearings may be taken up, in any case, withoutaltering, to any observable extent, the position of the pistonin the cylinder, and this permits small cylinder clearance,also. For the reason above given, the port spaces aremade no larger than is necessary. A comparison of this engine with others of its class will 90 STEAM ENGINES FOR exhibit one very peculiar feature, in which this enginestands entirely alone. The governor is carried on a gov-ernor shaft which is geared to the main shaft, and whichhas no other office than that of carrying the governor andthe eccentrics. It is evident that so radical a departurefrom standard design must have been caused by the possi-bility, actual or presumed, of thus attaining some very im-portant result. A little study shows plainly what thissupposed advantage must be. The necessity of providing for efficient perform
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectsteamen, bookyear1890
