. The street railway review . ING STEAM ENGINE PERFORMANCE. In our issue for February, 1900, page 72, we published an abstractof a paper by Prof. William Ripper, head of the technical depart-ment and professor of engineering at the University College, Shef-field, Eng., describing a continuous mean pressure indicator forsteam engines invented by him. This indicator consists of an ar-rangement of valves and gages connected so that the pressure fromthe steam end of the cylinder acts on one gage and the pressurefrom the exhaust end of the cylinder acts on the other. By twothrottling cocks the rang
. The street railway review . ING STEAM ENGINE PERFORMANCE. In our issue for February, 1900, page 72, we published an abstractof a paper by Prof. William Ripper, head of the technical depart-ment and professor of engineering at the University College, Shef-field, Eng., describing a continuous mean pressure indicator forsteam engines invented by him. This indicator consists of an ar-rangement of valves and gages connected so that the pressure fromthe steam end of the cylinder acts on one gage and the pressurefrom the exhaust end of the cylinder acts on the other. By twothrottling cocks the range of movement of the pointers on thegages is reduced to a small amount, without affecting, however, theaccuracy of tlic indication. Thus the difference between the read-ings of the two gages is the mean effective pressure on the pistonmeasured on a time basis. The ordinary indicator gives the meanpressure on a distance basis but Professor Ripper found that a con-stant correction factor would in most cases bring the mean pres-. IOWEH nO.\Kll Ol •■ sure as shown on his recording gage into agreementwith the inditfator. Professor Hi|)per has further developed his method and in thecurrent number of the Engineering Magazine describes the prac-tical application ol the instruments in the engine room of thesteamship Saxonia. This ship has quadruple expansion enginesand each cylinder has a pressure instrument attached. For reduc-ing the several mean pressures to the equivalent mean pressure onthe low pressure cylinder several scales are arranged on what iscalled a power board with grooves and sliding buttons, eachhaving two pointer-s, so that when set with one pointer at the meaneffective pressure as indicated by the instrument, the other pointermarks on a parallel scale the equivalent pressure on the low pres-sure piston. Thus the distribution of work among the several cyl-inders of the engine can be noted at a glance. On the same board o SlUT. 15. 1()(1(1. STR
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
