Abstract
W. P. WILSON describes in the Engineering Supplement to the Siemens' Magazine of November the A.R.P. telephone and signalling system, A.R.P. (No. 186) devised by Messrs. Siemens. One of the essentials of any system is the provision of a trustworthy method of giving the various signals required, and maintaining rapid communication between the personnel concerned. For obvious reasons it is not desirable for private A.R.P. organizations to use sound signals; it is usual, therefore, to employ bells or buzzers and visual lamp signals of various types, communication being maintained by a suitable telephone system.
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A.R.P. Communication. Nature 147, 92–93 (1941). https://doi.org/10.1038/147092b0
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DOI: https://doi.org/10.1038/147092b0