 Some years later, Akroyd-Stuart's design was further developed in the United States by the German emigrants Mietz and Weiss, who combined the hot-bulb engine with the two-stroke scavenging principle, developed by Joseph Day to provide nearly twice the power, as compared to a four-stroke engine of same size.Similar engines, for agricultural and marine use, were built by J. V. Svensons Automobilfabrik, Bolinders, Lysekils Mekaniska Verkstad, Pythagoras Engine Factory and many other factories in Sweden.Akroyd-Stuart's engine was the first internal combustion engine to use a pressurised fuel injection system and also the first using a separate vapourising combustion chamber.