Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 221
ic central stations are used principally where afire-alarm system requires two or more circuits but is notlarge enough to warrant the attendance of operators.Automatic repeaters are used in such stations for repeatingsignals that come in on any one circuit over all the othercircuits. These… … Fig. n. have been devised by Skelton, Kirnan, Cole and others.Fig. II shows an 8-circuit automatic repeater made by theGamewell Fire Alarm Telegraph Co. The operation of a Gamewell repeater will be under-stood by a consideration of Fig. 12, which shows the re-peating arrangement and one box-circuit…
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