A number of items on signalling including Burbridge signalling system, Skinner's Day Signalling Apparatus and Captain Gavin's Simplex Code for Day and Night Signalling.
A number of items on signalling including Burbridge signalling system, Skinner's Day Signalling Apparatus and Captain Gavin's Simplex Code for Day and Night Signalling. (Manuscript) (MER/64-68)