KEITH BLACKMAN, LTD., LONDON, N.17

The KEITH system of high-pressure gas lighting consists of boosting the towns' gas supply from the normal 3 ins. water column pressure to a pressure of 81 in. to 90 in. water column (3 to 3½lb. pressure), imparting the energy to entrain the requisite amount of air at the injector of each lamp, and so form a self-burning mixture.

The KEITH Lamps have been designed specially for the KEITH System, and are made in sizes of 500 c.p., 1,000 c.p., 1,500 c.p. with one mantle, also two-light and three-light column and suspension lamps with a candle power up to 4,500.

A single-light lamp of "Squat" type generally supplied, usually in 1,000 candle-power size. The lamps can be arranged with automatic lighters or governed flashign by-pass cocks. The former, where lamps are controlled from a central compressing station, automatically light up and extinguish.

Specially designed for street lighting, suspended either from bracket arms on columns or walls, or centrally suspended from span wires across the street. This lamp was designed in conjunction with the South Metropolitan Gas Co.