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Updated: May 17, 2025
With the drum, one tap indicates a dot and two taps in rapid succession a dash. Although these signals can be used with a dot and dash code, they should be so used in connection with a preconcerted or conventional code. Signaling by Two-Arm Semaphore. Signaling by the two-arm semaphore is the most rapid method of sending spelled-out messages.
Conceive of its possibilities, of its annihilation of time and space, of its distant control, and of that which it is made to mean and represent in the spelled-out words of language, and it still remains one of the wonders of the world: the Electric Telegraph. MAGNETS AND MAGNETISM. Having described a magnet that is made and unmade at will, it may be appropriate to describe magnets generally.
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