Diameter of shaft in hub of revolving
element, inches 37-1/16 37-1/16

The guarantees under which the main engines are being furnished, and
which will govern their acceptance by the purchaser, are in substance
as follows: First. The engine will be capable of operating
continuously when indicating 11,000 horse power with 175 lbs. of steam
pressure, a speed of 75 revolutions and a 26-inch vacuum without
normal wear, jar, noise, or other objectionable results. Second. It
will be suitably proportioned to withstand in a serviceable manner all
sudden fluctuations of load as are usual and incidental to the
generation of electrical energy for railway purposes. Third. It will
be capable of operating with an atmospheric exhaust with two pounds
back pressure at the low pressure cylinders, and when so operating,
will fulfill all the operating requirements, except as to economy and
capacity. Fourth. It will be proportioned so that when occasion shall
require it can be operated with a steam pressure at the throttles of
200 pounds above atmospheric pressure under the before mentioned
conditions of the speed and vacuum. Fifth. It will be proportioned so
that it can be operated with steam pressure at the throttle of 200
pounds above atmospheric pressure under the before mentioned condition
as to speed when exhausting in the atmosphere. Sixth. The engine will
operate successfully with a steam pressure at the throttle of 175
pounds above atmosphere, should the temperature of the steam be
maintained at the throttle at from 450 to 500 degrees Fahr. Seventh.
It will not require more than 12-1/4 pounds of dry steam per indicated
horse power per hour, when indicating 7,500 horse power at 75
revolutions per minute, when the vacuum of 26 inches at the low
pressure cylinders, with a steam pressure at the throttle of 175
pounds and with saturated steam at the normal temperature due to its