from The Century Dictionary.
- noun A device in which the flow or feed of a liquid is controlled by the rise and fall of a float: specifically, a device for carburetting an air-current in motor-cars, or in internal-combustion engines, in which the rising of the level of the liquid gasoline raises a valve to close the flow from the inlet, and a lowering of the level opens the flow again. Much used in modern motor-cars.
Sorry, no etymologies found.
It has a float-feed carburetor, mechanical oiler, and the ignition system is the jump-spark -- the best for this style of motor.
Most of these vaporizers use the heat and the exhaust gases to vaporize the fuel, but they differ greatly in construction; some are of the retort type, and others are of the float-feed carburetter type.