A White steam car is, in general outline and appearance, very like a petrol-driven car, and the cautious Mr. Worley Beaumont, who is honorary consulting engineer to the Automobile Club and consulting engineer to the Commissioner of Metropolitan Police, has written thus: "The makers of these cars are to be congratulated upon the possession and development of a type of steam generator which, in combination with a cleverly designed engine and well devised and constructed auxiliary gear and parts, has made it possible to produce a car capable of continuing to compare favourably with those propelled by the petrol engine." The essential points are the steam generator, which it is simpler to call the boiler, and the burner, or fire. The generator is an ingenious arrangement of coiled tubes, fed with water from the top, always containing, when the fire has been kindled, some water as well as a sufficient supply of superheated steam. The burner is, to quote Mr. Beaumont, "in form a shallow drum, the upper face of which is annularly ridged. The ridges are sawn or slit through at close intervals, and provide openings through which the combustible gas and air mixture combines with additional air flowing upwards through the numerous openings in the tubes." In other words the fuel, petrol, or benzolene ingeniously vaporized, is forced into the annular ridges, there mixes with air, and the mixture burns fiercely. The steam temperature is most cleverly controlled by the "thermostat," which may be described sufficiently for popular purposes by stating that it regulates the force of the fire automatically by the temperature of the steam, the automatic regulation being founded on the different expansions of brass and steel under varying degrees of heat. There are great opportunities, too, for humouring the engine, through the burner and generator of course, by the adroit use of the throttle.