CHAPTER VII

GAS AND OIL ENGINES

Some early gas engines, p. 133--Dr. Stirling's hot-air engine, p. 133--Ericsson's hot-air engines, p. 134--The first practical gas engine, p. 135--The Otto gas engine, p. 136--Otto's improvement by means of compressed gas, p. 138--The "Otto cycle," p. 139--Adaptation of gas engines to automobiles, p. 140--Rapid increase in the use of gas engines, p. 141--Defects of the older hot-air engines, p. 145--Recent improvements and possibilities in the use of hot-air engines, p. 146.