had gone that bugbear of underground telegraphy, "electrical able means of preventing accidents on the rail, and it very far with his investigations, he discovered that induction," and he found it. is but fair to say that it has made an excellent record. what made underground electrical… … way car, with which wire he connects a tele- ception of colors may be defective. Many able Fig. 2.-THE TRACK TELEGRAPH WIRE. electricians have believed the solution of this graph sounder located within the car. When- problem to lie within the domain of electrical ever an electrical signal is sent…
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