A cheat sheet for the bell and jingle code hangs in the fidley of the MARY A. WHALEN. It can be seen in the related entry  Bells are Direction, Jingles are Speed which lays out the system. The bell and jingle code was used by the captain...

The MARY A WHALEN is a rare surviving example of a bell boat. On a bell boat, the person steering (the captain or the mate) has no direct control over the speed of the engine, nor whether the ship goes forward or in reverse. The engineer, as the...