Submarine Telegraphy in the Post-War Decade

The post-war decade, which has given to the technique of the submarine telegraph both the regenerative repeater and the inductively loaded cable, deserves to be chronicled as one of the most significant periods in the history of the cable art. These two major developments and some important corollary inventions and applications are discussed in this paper. Reference is made to articles previously published describing recent developments at length. In addition the paper contains descriptions of: A two-element cable recorder code adapted to land-line transmission. A three-element Wheatstone code adapted to cable transmission. A cable printer system using a two-element code of practically the same time length as three-element recorder code. A typical installation of Pernot superimposed cable carrier apparatus. A brief account of the steps which have been taken to balance an inductively loaded duplex cable. An appendix to the paper comprises a discussion of certain variables which affect the traffic capacity of cables.