When steam was king, and gasoline and diesel engines had been still of their infancy, hot bulb engines have been all the craze. They might burn any liquid combustible gasoline, may run without a battery ignition -- sometimes for days -- and they have been environment friendly, easy and robust. For a farmer, a fisherman or a saw-mill operator, where ruggedness and reliability were keys to survival, a sizzling bulb engine had it all. But it did not have all the pieces. It ran in a narrow rpm range, about 50 to 300, and therefore had restricted use. It was best as a stationary engine, although there have been tractors that used the technology to move -- albeit slowly. The engine was onerous to start out, EcoLight products and laborious to maintain going. At present the engines are a mainstay for critical collectors and characterize one of the historic landmarks in the evolution of fuel engines. The engine's capability to run on plenty of fuels could even assist engineers manufacture a better trendy engine to handle a variety of other fuels.