Experimental Engineering. - Volume 1 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 Excerpt: ...in pressure in the valve chest diagram appear to lag behind those which Ave should expect to occur. At C the companion cylinder takes a charge causing a reduction of pressure. At E the first cylinder again takes steam, and the diagram is traced through F, and after cutoff the pressure rises to the boiler pressure, until at G the companion cylinder takes another charge. Another set of steam chest diagrams is given in Fig. 282. The uppermost was taken from a Corliss engine running at 70 revolutions per minute, the cut-off taking place at 20 per cent of the stroke. The maximum fluctuation was 16 lb. per square inch. The second diagram was taken from a similar engine at 00 revolutions per minute, but with a separator of inadequate volume. The third diagram was taken after a larger separator had been fixed. The last diagram was obtained from a compound Corliss engine, which was fitted with a separator of moderate capacity. The fluctuation is quite small. The next diagram, Fig. 283, was taken from a McNaughted beam engine, the cylinder and steam chest diagrams being taken with different rigs, causing their lengths to be different. If the latter diagrams were expanded to the same length of stroke, it would be found that its features would agree very well with those of the cylinder diagrams. CHAPTER X. ADJUSTMENT OF THE SLIDE VALVE. (89.) Valve Setting by the Indicator.--The state of adjustment of the valves in a steam engine can be much more readily and certainly ascertained by the use of the indicator than in any other manner. Many of the diagrams already given form exercises in valve setting, but those immediately following were taken during the adjustment of the slide valve, and consequently are more suitable for examples just here. A small engine, which the au...