The instruments used for land telegraphs on this system are of two types - " sounders," which indicate by sound, and " recorders," which record the signals. [Please select]
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Closing either key will operate both sounders, and, as the resistance of [Illustration: Simple Telegraph Line] the sounders is very high, the batteries do not run down for a long time. [Please select]
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By the end of his second year he had had his finger in many pies and had worked on about every sort of electrical contrivance then known: call bells, annunciators, galvanometers; telegraph keys, sounders, relays, registers, and printing telegraph instruments. [Please select]
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_ A TELEGRAPH CIRCUIT] The other line wire (B), between the two stations, has its opposite ends connected with the terminals of the electro-magnet C of the sounders. [Please select]
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