. Electric railway journal . rential Method of Testing Is Adaptedto Measurements in Paved StreetsIn the tests on roadbeds where a limited section ofthe track could not be isolated, the method illustratedin Fig. 1 was employed. After car traffic had ceasedfor the night a portable storage battery was connectedas shown between the four rails and a water hydrant, urements at several slightly different locations at eachstation and by determining the average potential dif-ference between the track and the earth by means ofa number of different underground structures, a fairdegree of accuracy was sec
. Electric railway journal . rential Method of Testing Is Adaptedto Measurements in Paved StreetsIn the tests on roadbeds where a limited section ofthe track could not be isolated, the method illustratedin Fig. 1 was employed. After car traffic had ceasedfor the night a portable storage battery was connectedas shown between the four rails and a water hydrant, urements at several slightly different locations at eachstation and by determining the average potential dif-ference between the track and the earth by means ofa number of different underground structures, a fairdegree of accuracy was secured. The most reliableand consistent results were obtained by driving a groundrod into the earth not less than 50 ft. from the trackand measuring the potential difference between it andthe track with a high-resistance voltmeter. The differential method was employed on the Wis-consin Avenue line in Washington at two different rMI/voltmefen, I / \bo v- r r ■■: > T r ! — r — r < r \ — r Cross -Bond r *-. Xross Bonds--> \ X^Otod^O^-f, |vmJ b« r~A?->i T~ KType AH Type^F Type B Type C Type D Type E Type G Type AT Type AA Type BT Type H Type DT Type EC Type EZArr<ano|emen+ of Experimental RoadbedsFIG. 3 -J Girder Raily „-Pavinq Brick Sand Cushion 5 Ty p e A
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