. The street railway review . the engine cylinder D by thepipe as shown, and at the bottom of the glass the gage pipe is at-tached. There are regulating cocks at E and F. When the cock Eis opened wide and the engine is running, the change or pressurein the cylinder between the driving and the exhaust stroke causeda more or less violent agitation of the water in A, being the moreviolent as the range of pressure was greater. When the rangeof pressure was not more than about lO lb., the water in the glasswas quiet; but when the range of pressure exceeded this (by in-creasing the load on the engin
. The street railway review . the engine cylinder D by thepipe as shown, and at the bottom of the glass the gage pipe is at-tached. There are regulating cocks at E and F. When the cock Eis opened wide and the engine is running, the change or pressurein the cylinder between the driving and the exhaust stroke causeda more or less violent agitation of the water in A, being the moreviolent as the range of pressure was greater. When the rangeof pressure was not more than about lO lb., the water in the glasswas quiet; but when the range of pressure exceeded this (by in-creasing the load on the engine) agitation again began. The actionappeared to be due first to the heating of the water in the tubeby the rush of steam, with globules of hot water, into thetube; and secondly, to the re-evaporation of the heated water whenthe pressure fell during expansion and exhaust in the is not possible to give numerical data as to the effect of difTer-ent ranges of pressure, because the behavior of the water was most. erratic. Sometimes, with a given range of pressure in the engine,the water was violently agitated and would disappear from the glassin a few minutes; in other cases it would remain quiescent in theglass for hours, though the conditions appear to be it would suddenly commence to boil and to disappear withoutany apparent cause. But in all cases of agitation of the water inthe tube A, when the cock E was throttled down the agftationimmediately ceased. The amount of throttling of the cock E wliich was necessary tostop the agitation still left a 4airly large movement of the gagefinger across the scale, and the final adjustment for steadying thefigure to the smallest possible movement was obtained by throttlingthe cock F. Throttling the cock E had no effect on the pressurereading by the gage unless the throttling was carried too far. Itwas not necessary in order to stop the ebullition to throttle thecock E so far as to reduce the pressure. If any
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
