. Railway master mechanic . en lead is then poured into the mould. The metal will of course readily penetrate the spaces between the crystals, which are embedded in the molten mass. When the lead cools it is sawed into disks of the de-sired thickness, and the plates are placed in water to dissolve the salt. When this process has been completed the plates are full of irregular cavities of the form of the salt crystals. The active material, oxide of lead, commonly known as red lead or minium, is introduced into the cavities. It will be j AnTcsn Eailway Master Mechanics Asaociatii readily seen th
. Railway master mechanic . en lead is then poured into the mould. The metal will of course readily penetrate the spaces between the crystals, which are embedded in the molten mass. When the lead cools it is sawed into disks of the de-sired thickness, and the plates are placed in water to dissolve the salt. When this process has been completed the plates are full of irregular cavities of the form of the salt crystals. The active material, oxide of lead, commonly known as red lead or minium, is introduced into the cavities. It will be j AnTcsn Eailway Master Mechanics Asaociatii readily seen that as the irregular spaces which had | Location of the Jane Convention. been occupied by the salt are larger inside than out-side, the active material cannot drop out. The plates are shaped and connected in the usual way, and the positive and negative electrodes are insul-ated from each other by hard rubber dividers. The closed end of the divider is put at the bottom, thus .ach plate is independently supported by two l10i;iiLE HEAI The closed end of the divider holds the lowei edge ofthe plate about an inch above the bottom of the this way the possibility of short circuiting by theaccumulation of matter on the bottom of the jar isprevented. The special adaptability of this battery for tractionpurposes is explained thus by its makers: 1. The plates possess great solidity, a featurewhica makes it possible for the cell to withstand thehard usage it is liable to encounter on railroads,street cars, etc. 2. The positive plates do not buckle, and the cellgives no trouble whatever. •3. The plates are constructed of porous leadthe pores, which are tilled with the active materialare of a wedge-shaped form so that it is quite impossible for the parts to be shaken out by the vibra-tion or jolting of the car. 4. These cells will withstand the high rates ofdischarge for which they are often called upon instarting the cars or ascending steep grades. The purchase of the contro
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Keywords: ., bookcentury1800, bookdecade1870, bookidr, booksubjectrailroadcars
