Chadburns

"An engine order telegraph or E.O.T., often also chadburn, is a communications device used on a ship (or submarine) for the pilot on the bridge to order engineers in the engine room to power the vessel at a certain desired speed." - wikipedia / www.deviantart.com/users/outgo…

These are in the collection at the Cemaes Maritime Museum www.cemaesmaritimecollection.c…