The New C.m.b. Battery System.

Messrs. J. C. Macfarlane and H. Burge (of Crompton and Co., Ltd., Chelmsford), the inventors, outlined a new system of transmission and control for battery-driven, or pe......

Fire Extinction By Gas Bubbles.

Interesting Tests of a New Method of Tackling Petrol Fires. One of our corresPondents recently witnessed some convincing tests with a new and very practical form of......