pressure. The guarantee includes all of the steam used by the engine
or by the jackets or reheater.

The new features contained within the engine construction are
principally: First, the novel construction of the high-pressure
cylinders, by which only a small strain is transmitted through the
valve chamber between the cylinder and the slide-surface casting.
This is accomplished by employing heavy bolts, which bolt the shell of
the cylinder casting to the slide-surface casting, said bolts being
carried past and outside the valve chamber. Second, the use of poppet
valves, which are operated in a very simple manner from a wrist plate
on the side of the cylinder, the connections from the valves to the
wrist plate and the connections from the wrist plate to the eccentric
being similar to the parts usually employed for the operation of
Corliss valves.

Unlike the Manhattan engines, the main steam pipes are carried to the
high-pressure cylinders under the floor and not above it. Another
modification consists in the use of an adjustable strap for the
crank-pin boxes instead of the marine style of construction at the
crank-pin end of the connecting rod.

The weight of the revolving field is about 335,000 pounds, which gives
a flywheel effect of about 350,000 pounds at a radius of gyration of
11 feet, and with this flywheel inertia the engine is designed so that
any point on the revolving element shall not, in operation, lag behind
nor forge ahead of the position that it would have if the speed were
absolutely uniform, by an amount greater than one-eighth of a natural
degree.