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	Charles Wheatstone William Cooke Samuel Morse The Need for Codes Learn Semaphore Learn Morse code Voltage, Current, Resistance Basic Principles of Telegraphy A Simple Morse Circuit Construction of Telegraph Cables Faults in Submarine Telegraph Cables Testing a Cable How Capacitance works Gutta Percha The Morse Key	(Requires Flash plugin)   Text-only version   This demanded the highest possible precision in design of test sets, and threw a great responsibility on the engineer who manipulated it and calculated the results. Sending the ship to the wrong piece of ocean was a very serious offence. Image: Second Electrician T.C. Partridge in the cable testing room on board the cable ship STANLEY ANGWIN, 1952   These same devices enabled signals to be exchanged with the repair ship, and cable test sets often incorporated cable-keys that doubled as testing and signalling devices. Image: Single current and cable code keys as seen on the test set.
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