It is a fact that with all injectors as the vertical distance the injector lifts is increased, it requires a greater steam pressure to start the injector, and the highest steam pressure at which the injector will work is greatly decreased.

If your engine is fitted with both cross head pump and injector, you use the injector for pumping water when the engine is not running.

This is most effectively done by covering the injector with a cloth and pouring water over the cloth.

If the water in the tank does not become heated, and no foreign substance is permitted to enter the injector, there is nothing to prevent its working properly as long as the conditions are within the range of a good injector.

I was not surprised at this for up to a few years ago there were a great many engines running throughout the country with only the independent or cross-head pump, and engineers wishing to adopt the injector naturally want the best, while others had injectors more or less unsatisfactory.

A, cylinder; B, gas conduit; C, rubber pockets; D. gasometer; E, purifier; F, scrubber; G, hydraulic main; H, cooling pipe; I steam injector; K, steam boiler and superheater; L, gas generator; M, charger; N, discharge of the motor.]

When the exact quantity of water consumed per hour is known it can be easily determined from the capacities given in the price lists which sized injector must be selected.

To start an injector of the Pemberthy type; first give it sufficient steam to lift the water, allowing the water to escape at overflow for a moment or long enough to cool the injector, then with a quick turn shut off and open up the supply which requires merely a twist of the wrist.