A Development In Trolley-bus Control

T lEmrecently granted patent (384,433) of Mr. J. G. Smithson, of Oakdale, Alvechurch, Worcestershire, should be of great interest to those concerned with the operation of......

The Marchant-stewart Electro-magnetic Injector

I N our recent description a the interesting Marchant-Stewart oil engine, we mentioned the fact that the injectors, or, rather, injector pumps, employed were of particularly......