They have them at both ends. The engine room needs to be able to tell the bridge that the order has been carried out.
The captain gives the order. The lee helmsman (telegraph guy) runs the handles all the way forward and all the way back, and then to the new setting. Each time the handles move the bell rings. The engineer then repeats this movement at his end, telling the bridge crew that he got the message and that they are carrying out the order.
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