. American engineer and railroad journal . ative indicator cards, andthe difference between the cards from the compound andsimple engines is remarkable. The diagram of the horse powerOf the Atlantic City engine, above 220 revolutions per minute, Februaky, 1890, AMERICAN ENGINEER AND RAILROAD JOURNAL 63 becomes a straight line similar to those secured by They indicate that the horse power increased in adirect proportion to the speed until 1,450 horse power at 70miles per hour was reached, and the power line was straight atthat point. This does not accord with the theory of criticals
. American engineer and railroad journal . ative indicator cards, andthe difference between the cards from the compound andsimple engines is remarkable. The diagram of the horse powerOf the Atlantic City engine, above 220 revolutions per minute, Februaky, 1890, AMERICAN ENGINEER AND RAILROAD JOURNAL 63 becomes a straight line similar to those secured by They indicate that the horse power increased in adirect proportion to the speed until 1,450 horse power at 70miles per hour was reached, and the power line was straight atthat point. This does not accord with the theory of criticalspeed by Prof. Goss, and while the increase of power in directratio with the increase of speed is difficult to comprehend,these records appear to establish this as a fact. ItIs noteworthy that the increase of power with the in-crease of speed was greater in the case of the roadengine than in the Purdue model. Fig. 2 compares thepower of the Atlantic City engine with the Purdue simpleengine known as Schenectady No. 1, and Fig. 3, reproduced. so so Speed, Mi/ei pe/-fiot//rFig. 3. from Pig. 18 of Mr. Vauclains discussion, compares the At-lantic City engine, No. 1027, with a single expansion the straight line for this engine was plotted from theactual results, the curved line having been laid down throughconservatism and lack of confidence In several of the divergence of these two straight lines, according to , represents the advantage from compounding. Hefurther states that properly designed valve motion will enablea simple engine to show an increase of horse power in theform of a straight line, and that the line will be straight up tothe limit of the endurance of the engine. Accepting the statements concerning the model and the At-lantic City engine as careful and accurate, to what do theypoint? Mr. Vauclain attributes the whole to the compounding,we may say to this particular type of compounding, and chieflyto the superior action of the valve moti
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