This is a Telex, an obsolete method of communication that preceded the Fax and we don't often see them. That makes this a forgotten corner.
Here's the engine it refers to after it was installed in the East Hall of the Science Museum. There is another forgotten corner concerning this engine. The original contract was that B&P were to install the engine as well as take it out of the mill at Harle Syke. This fell through when Newton Pickles was informed it was going to be driven by electric motor and he gave back word on the deal saying he didn't want anything to do with 'clockwork engines'.
He never admitted it but I think this was just an excuse. They made no money out of removing the engine and didn't expect to do any batter on the installation so Newton decided they could live without it.
The irony is that eventually the engine was installed in steam.... But that's another story!