the for- acts against the outside of this drum to press it toward the mer “ electrolytic insulation,” shelling disk, and from the inner side of the drum projects a = and the latter “ dielectric in- tube which surrounds the shaft, and is made of such a length sulation.” that its end, when pressed up… … the result; ware it otherwise, it would be easy to insulate vice is well spiked down to the sleeper, if would seem almost The sheliing disk is armed with teeth, as shown in the from earth the positive pole of the battery at the signaling impossible that the joint should not keep tight. engraving,…
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