Heavy balls attached to a governor are only requisite to overcome the friction of the throttle valve which shuts off the steam, and of the connections leading thereto.

He had time to yell at his fireman, to fling himself upon the throttle-bar and to set the airbrake before he began to turn Irish handsprings down the embankment; but the wrecking crew camped two whole days at Delhi gathering up the debris.

He kept one hand on the throttle control, whistling under his breath disconnected snatches of song.

[Illustration: THIRTY YEARS' ADVANCE IN LOCOMOTIVE BUILDING] HOW AUTOMOBILES WORK Every boy and almost every man has longed to ride on a locomotive, and has dreamed of holding the throttle-lever and of feeling the great machine move under him in answer to his will.

He pulled on his cap a little more firmly, and, after glancing at his watch, reached out for the throttle handle.

"Privilege throttles truth where it can.