. Railway master mechanic [microform] . both inlet and exhaust valve. As theentire engine revolves except the crank shaft and base, theengine is its own fly wheel. No muffler is employed. Auxiliary exhaust ports, whichlet out the high terminal pressure against the rapidly re-ceding volume of air, are used. There is no back pressure,the auxiliary exhaust ports reduce the pressure to that ofthe atmosphere before the exhaust valve in the head of thecylinder is open. The gases that pass out of the exhaustvalve are, therefore, comparatively cool. Air cooling is accomplished by the cylinder revolvin
. Railway master mechanic [microform] . both inlet and exhaust valve. As theentire engine revolves except the crank shaft and base, theengine is its own fly wheel. No muffler is employed. Auxiliary exhaust ports, whichlet out the high terminal pressure against the rapidly re-ceding volume of air, are used. There is no back pressure,the auxiliary exhaust ports reduce the pressure to that ofthe atmosphere before the exhaust valve in the head of thecylinder is open. The gases that pass out of the exhaustvalve are, therefore, comparatively cool. Air cooling is accomplished by the cylinder revolving at arapid rate, drawing in the air at the center and expelling itwith great rapidity at the ends of-the cylinders. The cylin-ders are provided with longitudinal ribs winch provide alarge radiating surface. The speed of the motor is controlled entirely by their vari-able compression system, Avhich consists of allowing thatpart of the charge not needed to give the motor the re-quired power to escape back by the inlet valve which is me-. A New Design oe Gas Engine. 478 RAILWAY MASTER MECHANIC November, 1904. chanically held open for a part of a compression stroke; thatpart of the charge so escaping being drawn in by anothercylinder. When the maximum power is required the inletvalve is closed at the end of the suction stroke and the fullcharge is compressed to about 95 lbs. per sq. in. When min-imum power is wanted the inlet valve is not closed untilthe completion of the compression stroke; an exceedinglysmall part of the charge is retained and ignited at atmos-pheric pressure, giving a gentle expansion. Variable com-pression is the entire source of control. The carburetter is entirely automatic. Gasoline is pumpedthrough the upper pipe into a constant level reservoir, whichis a small cavity covered with a watch crystal enabling thegasoline being seen. The surplus gasoline flows back intothe pump well through the lower tube. The spark is regulated automatically by their automatic
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