. American engineer and railroad journal . reduce them, the first being sq. ft.,and the second cub. ft. Assuming the steam to be cutoff at of the stroke, as before, the surface per cubic footof volume swept through by (he piston up to the end of ad-mission would be only sq. ft. The writer hoped to havebeen able to give a diagram from a cylinder of this design,but unfortunately the engine was not completed in time. There is one other point in connection with cylinder surfacewhich it may be well to touch upon, having regard to thelarge number of short-stroke inverted vertica
. American engineer and railroad journal . reduce them, the first being sq. ft.,and the second cub. ft. Assuming the steam to be cutoff at of the stroke, as before, the surface per cubic footof volume swept through by (he piston up to the end of ad-mission would be only sq. ft. The writer hoped to havebeen able to give a diagram from a cylinder of this design,but unfortunately the engine was not completed in time. There is one other point in connection with cylinder surfacewhich it may be well to touch upon, having regard to thelarge number of short-stroke inverted vertical engines whichare now built for driving mills. This is the effect of the ratiobetween the cylinder diameter and the stroke. To make the point clear without unnecessary complication,consider the two plain cylinders A B GD,ab cd, fig. 7, with-out ports or clearance spaces, A B C D having a piston areaof 1 sq. ft. and a stroke of 4 ft., and a b c d a piston area of4 sq. ft. and a stroke of 1 ft.; then both cylinders will have Fig- 7- am n A. Fig. 6. the same capacity, and with the same speed of rotation willdevelop the same power, with the same initial pressure andratio nf expansion. First, suppose the cut-off to take place at Mand m at one- 506 THE AMERICAN ENGINEER [November, i8g.(.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
