Chapter VII: Gas and Oil Engines

(pp. 135, 136, 137). Gas engines. Quoted from the report of the Victoria and Albert Museum above cited.

(pp. 141-144). Gas engines and steam engines in the United States. Quoted from the report of the Special Agents of the _Twelfth Census_ of the United States, 1902.

(pp. 146, 147). The Svea heater. From an article by Mr. G. Emil Hesse in _The American Inventor_ for April 15, 1905.