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.
[CHAP. VIII.]
METHODS OF CONNECTING THE PISTON-ROD AND BEAM IN THE DOUBLE-ACTING ENGINE.—RACK AND SECTOR.—PARALLEL MOTION.—CONNECTING ROD AND CRANK.—FLY-WHEEL.—THROTTLE-VALVE.—GOVERNOR.—CONSTRUCTION AND OPERATION OF THE DOUBLE-ACTING ENGINE.—ECCENTRIC.—COCKS AND VALVES.—SINGLE-CLACK VALVE.—DOUBLE-CLACK VALVE.—CONICAL VALVES.—SLIDE VALVES.—MURRAY'S SLIDES.—THE D VALVE.—SEAWARD'S SLIDES.—SINGLE COCK.—FOUR-WAY COCK.—PISTONS.—COMMON HEMP-PACKED PISTON.—WOOLFE'S PISTON.—METALLIC PISTONS.—CARTWRIGHT'S ENGINE.—CARTWRIGHT'S PISTON.—BARTON'S PISTON.