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.