DIMENSIONS OF ENGINE AND PARTS.

The bronze bass-relief upon the monument, made from the working
drawing furnished by Mr. Dripps, is an exact representation of the
locomotive when it arrived in America.

The engine originally weighed about ten tons. The boiler was thirteen
feet long and three feet six inches in diameter. The cylinders were
nine inches by twenty inches. There were four driving wheels, four
feet six inches in diameter, arranged with outside cranks for
connecting parallel rods, but owing to the sharp curves on the road
these rods were never used. The driving wheels were made with cast
iron hubs and wooden (locust) spokes and felloes. The tires were of
wrought iron, three quarters of an inch thick, the tread being five
inches and the depth of flange one and a half inches. The gauge was
originally five feet from center to center of rails. The boiler was
composed of sixty-two flues seven feet six inches long, two inches in
diameter; the furnace was three feet seven inches long and three feet
two inches high, for burning wood. The steam ports were one and
one-eighth inches by six and a half inches; the exhaust ports one and
one-eighth by six and a half inches; grate surface, ten feet eight
inches; fire box surface, thirty-six feet; flue surface, two hundred
and thirteen feet; weight, without fuel or water, twenty-two thousand
four hundred and twenty-five pounds.

After the valves were in gear and the engine in motion, two levers on
the engineman's side moved back and forth continuously. When it was
necessary to put the locomotive on the turntable, enginemen who were
skilled in the handling of the engines first put the valves out of
gear by turning the handle down, and then worked the levers by hand,