. The street railway review . of a foot of rail in eachjoint, which was also bonded with copper, was fully fivetimes the resistance of a foot of the same rail between thejoints. And the current carried by these rails was very much lessthan it should have been had the rails been making these tests I saw a report of a test in Milwau-kee of a few joints whose resistance was said to be lowerthan the rail. I therefore had my W^eston instruments recali-brated and took them to St. Louis to see what I could learnthere. On Monday, October 19th., I measured over 50 jointson two lines of
. The street railway review . of a foot of rail in eachjoint, which was also bonded with copper, was fully fivetimes the resistance of a foot of the same rail between thejoints. And the current carried by these rails was very much lessthan it should have been had the rails been making these tests I saw a report of a test in Milwau-kee of a few joints whose resistance was said to be lowerthan the rail. I therefore had my W^eston instruments recali-brated and took them to St. Louis to see what I could learnthere. On Monday, October 19th., I measured over 50 jointson two lines of double track in the vicinity of one of thepower houses. One of the 8 rails was dead ; the others were carryingrespectively 40, 90, 40, 40, 90, 180, 120 amperes. Thestation ammeters showed a wary much greater load than thesum of these amounts. Though the rails were quite wet atthe time of these tests and the conductivity of the joints wasthus greatly increased, the drop of one foot of rail at the joint (^tii^v^ihS^u^^hW^ 779. FIGURE 2—SECTION OF OLD CAST-WELD JOINT SHOWING CLEAR-ANCE BETWEEN IRON AND RAIL. was from 4 to 6 times the drop of one foot of rail betweenjoints. The followin<r is the average of over 50 measnrenients,not counting open joints, on cast-weld joints upon S5-poundrails in use about one year, with verv wet track. 40 amperes 012 volts drop. 80 amperes 03 volts drop. go amperes 042 volts drop. 100 amperes 050 volts drop. 150 amperes 060 volts drop. 180 amperes 064 volts drop. 200 amperes 096 volts drop. The joints were magnificent mechanically, making thesmoothest riding track I have ever seen. In looking aboutthe city during the convention, I found several broken jointsthat were being removed from the track and was unable tofind any traces of welding. I also examined two largescrap heaps of these joints in different parts of the city andmade a number of photographs which show clearly that acast-weld joint should be carefullv bonded. One of thesephotograph
Size: 1592px × 1569px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
