. The street railway review . oltmeters and ammeters, afford iuformatloa as to the output ofeleotiical macliixiery in the power house at any instant, andnow nearly all large roads have also installed recording watt-meters which give tlie total output of the electrical it is by no means necessary to have similar records asto the powei- developed in the engine cylinders, such records areliighly desirable in order to determine the efficiency of tliemachinery. At the present time the output of the cylinder isusually computed from the electrical log after making tests todetermine w
. The street railway review . oltmeters and ammeters, afford iuformatloa as to the output ofeleotiical macliixiery in the power house at any instant, andnow nearly all large roads have also installed recording watt-meters which give tlie total output of the electrical it is by no means necessary to have similar records asto the powei- developed in the engine cylinders, such records areliighly desirable in order to determine the efficiency of tliemachinery. At the present time the output of the cylinder isusually computed from the electrical log after making tests todetermine what allowance should be made for engine friction,but everyone realizes that this is OTJly a makeshift. Witli avariable load, such as is found in railway power houses, thesteam engine ijifUcator of tie ordinary type can give only ap-proximate results, and in addition the labor of computing thepower from the diagrams is very great if they are taken at shortintervals. There have been a numljer of continuous engine indicators de-. ATWOOD POWER GAGE. signed, one of which was the inveni:ion of W. G. and C. W. , and illustrated in the Review for February last. Thisinstrument is not so well adapted for constant use but could notfail to be valuable in investigating the efficiency of engines^ andin determining the power required for various machines. A power gage especially for continuous use has been inventedby G. P. Atwood and is made by the Atwood Power & SpeedGage Company, of 95 and 97 Liberty street. New York. Anumber of the gages have been in continuous operation on theengines of the Peoples Electric Light & Power , N. J., for over 18 months and the comparisons madewith indicator diagrams show a variation of less than 1 percent. The Atwood gage consists of a turbine driving a fan, a secondfan connected with a dampening device and spring and drivenby the first fan, and suitable nozzles and valves for directingjets of steam from the engine cylinders upon the tti
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
