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The Engine Order Telegraph (EOT) is used to control the main engine's speed in RPM's. Orders on the telegraph are called bells since the old fashioned telegraphs would ring a bell down to the engine room for the engineers to see and then manually adjust the speed of the engine (like the scenes in the movie Titanic for example). Modern ship's telegraphs have direct control to the main engine from the bridge with the option of having the engineers take control and to answer bells from the bridge. All engine orders are logged and recored either automatically using a bell logger, or by hand in the bell book as seen in this video. Engine orders are given for both ahead and astern bells and are commonly used when approaching ports or while in the channel under the direction of the pilot.
#telegraph #bellbook #lifeatsea