(The first two parts of this article appeared in the GAZETTE of November, 1931, and February, 1932. It is here continued.)
* The preceding parts of this article give a rough historical background, and volumes can be written about the dirsty past of Signal Communication, but there is neither space nor time for such. The development of modern means and methods are of more interest and import. Due to lack of time and space, even this must at best be sketchy.
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