A telegraph in a tunnel, Lehigh and Susquehanna Railroad

Telegraph in a Tunnel.

THE successful and thorough insulation of telegraph lines in wet tunnels has heretofore been a problem whose solution was attended with much difficulty. In Europe the wires are covered with gutta percha and placed in wooden troughs or boxes attached to the walls of the tunnel. In this country the wires have usually been carried over the top of the tunnel, which, in many instances, is a very difficult and expensive piece of work. Recently the telegraph line of the Lehigh and Susquehanna R. R. in Pennsylvania has been carried through the Nesquehoming tunnel, 4,000 feet in length, upon Brooks insulators, and, notwithstanding the dampness and moisture, not a trace of leakage is perceptible. This piece of telegraphic engineering was executed by a railroad man, and has turned out to be an unequivocal success.