Electrolytic survey of loop district in Chicago and electrolysis of water mains . showing our night readings. 31 Van Buren Street, Betv/een Stateand Wabash Avenue, May 28ti:, 1908. Length 8 Inche s TIl-IE E Volts 12 J 09 .045 12jl0 .070 12:11 .20 12:12 .030 12:13 . 12:14 .045 12:15 .050 12:16 .030 12:17 .030 12:18 .040 12:19 .0 12; 20 .0 ITIGHT READIITGS,Diop from hydrant to rail voltsDrop from hydrant to L post -, 60 volts DAY READIITGS. Drop in main v;as volts Drop from hydrant to rail volts Drop from hydrant to L post about zero. 32 COHCLUSIOIT. 33 MEASUEEIi^ll
Electrolytic survey of loop district in Chicago and electrolysis of water mains . showing our night readings. 31 Van Buren Street, Betv/een Stateand Wabash Avenue, May 28ti:, 1908. Length 8 Inche s TIl-IE E Volts 12 J 09 .045 12jl0 .070 12:11 .20 12:12 .030 12:13 . 12:14 .045 12:15 .050 12:16 .030 12:17 .030 12:18 .040 12:19 .0 12; 20 .0 ITIGHT READIITGS,Diop from hydrant to rail voltsDrop from hydrant to L post -, 60 volts DAY READIITGS. Drop in main v;as volts Drop from hydrant to rail volts Drop from hydrant to L post about zero. 32 COHCLUSIOIT. 33 MEASUEEIi^llTS OF RESISTAITCE OF PIPEJOINT OF 6 PIPE 12 • Tills pipe was msasioredat 22nd Street and Ashland Avenueat the City Water Pipe SupplyDepartment. A water rheostatwas used tc reduce the pipe named was in servicefor three years and it was evidentthat the ioint resistaaice increases with the time it is in the was necessary to use a( 0 - 10 ) voltmeter for theresistance of the pipe ;5oint,while for the pipe, without thejoint, a mini-voltmeter was used. ?;.i. tMUTlXOTE OP TiSCKMOLOOThJkitt*MX, , 34 METHODS OF PRE\7E1TTI11G ELECTROLYSIS. Using alternat/ing currentnearly eliminates it. If directc^orrent must be used, liave noground returns for the trollycurrent, but have a doubletrolly so as to return the currentto the Power House in that grounD returns must be used,all bonding of rails should bewelded because the loints arsthe places where the straycurrent leaves the rails. Methods have beenproposed for insulating the pipeby means of a preparation, butthis is not the best method,because if a certain portion ofthe pipe should be disposed bysone carelessness or wear, thestray current would pit this tV 35 spot and hence destroy the cheap method may be used byconnecting the rail to the pipeat short intervals, and henceallovj the pipe to act as a shuntfor the current. Since currentalways passes through the pathof the least resistance
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Keywords: ., bo, bookcentury1900, bookdecade1900, bookidelectrolyticsurv00bueh
