Ship's engine order telegraph. The device in the engine room that provides the instruction from the ship's bridge as to the desired engine setting. It contains a bell that sounds when the setting is altered.
<a href="//commons.wikimedia.org/wiki/User:TedColes" title="User:TedColes">TedColes</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>