. The Street railway journal . When the old-fashioned chair joints were aban-doned and fish plates (two straps of iron) were adopted, achange for the better as regards vertical strength, was secured,though all support of the base of the rails was sacrificed, beingdependent on the bearing or support these straps gave at the pointof contact under the head of the rail, assisted somewhat by a one-tie support at the rail ends. As creeping of track had to be pre-vented without slot-ting the base of therails, suspended jointscame into use with aflange to the fishplates at their base,extending beyond
. The Street railway journal . When the old-fashioned chair joints were aban-doned and fish plates (two straps of iron) were adopted, achange for the better as regards vertical strength, was secured,though all support of the base of the rails was sacrificed, beingdependent on the bearing or support these straps gave at the pointof contact under the head of the rail, assisted somewhat by a one-tie support at the rail ends. As creeping of track had to be pre-vented without slot-ting the base of therails, suspended jointscame into use with aflange to the fishplates at their base,extending beyond andlevel with the base ofthe rail, so as to allowa slot or hole in thisfoot, independent ofthe rail base. Thisgave the so-calledangle bar, whichfurnished greater ver-tical and lateral strength. Both of these types of joints are, olcourse, dependent for support upon frequent tamping of the jointties. This, even on exposed track, is expensive, but for tracks onpaved streets is practically impossible. As a result, the failure of. FIGS. 2 AND 3 similar to a person with no support under his feet, but hung upby his ears. Another cause for failure is wher: both joint bars have ovalholes for cup head bolts, with round holes in the rail in. largerthan the bolt shank, so as to allow an opening of Y% in., as shownat Figs. 5 and 6. One remedy to prevent such joints is to have
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
