FOOTNOTES:

[20] These effects are explained in my Treatise on Heat; and they have lately been verified by experiments made with locomotive engines by M. de Pambour, who found that the steam raised from the boiler of a locomotive engine, under a pressure of above 50 lbs. per square inch, was in the state of common steam as it issued from the chimney at a very diminished pressure and at a lower pressure.

[21] It is strange that this absurdity has been repeatedly given as unquestionable fact in various encyclopædias, as well as in by far the greater number of treatises expressly on the subject.

[22] Farey, Treatise on the Steam Engine, p. 122.

[23] Farey on the Steam Engine, p. 297.

DOUBLE-ACTING ENGINE.—CITY SAW-MILLS.