Engine order telegraph

Traditional EOTs required a pilot wanting to change speed to "ring" the telegraph on the bridge, moving the handle to a different position on the dial.

As such, it is regarded under the rules of marine classification societies as a remote control device rather than an EOT, though it is still often referred to by the traditional name.

Traditional EOTs (though in a more modern form) can still be found on all nuclear powered ships and submarines as they still require an engineering crew member to operate the throttles for the steam turbines that drive the propellers.

EOTs can also be found on older vessels that lack remote control technology, particularly those with conventional steam engines.

This sends an electrical signal to the bridge EOT unit, causing its pointer to acquire the respective position.

Many modern ships have the following dial indications: "Finished with engines" and "standby" conveyed via separate control panel.