"The Telegraph"
of USS ENTERPRISE CV-6
..

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Another piece of equipment removed from the navigation bridge of the carrier Enterprise (CV6) is the engine order telegraph. For those whose familiarity with shipboard operations comes from Hollywood war movies, lines like 'all ahead one third' relate to the engine order telegraph. Upon hearing an order from the officer of the deck (OOD), the sailor manning this device would throw the handles forward or backward, triggering a bell in the engine room that signaled personnel there to adjust engine power.
From: Naval Aviation Museum Web Note!

  
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