An ambient air vaporiser is used to vaporise stored liquid during peak demand. For this purpose, a vaporizer (or vaporiser) is placed in the intake system. He obtained patents, including a patent for an oil vaporiser in 1885. In 1926 he developed an improved version of the carburettor named the Godward Vaporiser. Such a setup was called a vaporiser. At the same time fuel is sprayed into the vaporiser. A hot bulb engine features a prominent hot bulb vaporiser; a diesel engine does not. Some 580 buses and 3000 taxis were fitted with the vaporiser. The Vaporiser enabled motor vehicles to use fuel oil instead of petrol. The United States Army Transport section at Camp Holabird also successfully trialed the Vaporiser. A vaporiser was no longer necessary, but the bag was large and cumbersome.