Summary

Diagram showing the method by which connections are made in telegraph instruments at both terminal and intermediate stations on the closed and open circuit systems. In each case the connections between the batteries, relay, register, key and lightning arrester are shown.

Published by the Chief Electric telegraph Office in 1874

Description of Content

Diagram showing the method by which connections are made in telegraph instruments at both terminal and intermediate stations on the closed and open circuit systems. Published by the Chief Electric telegraph Office in 1874

Physical Description

Folding lithographed sheet- approximately A3 size.

Significance

Contemporary working diagram which would assist in understanding the way in which a number of telegraph items in the collection would have been used.

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