.6 pounds;
one-half load, 625 kilowatts, 16.2 pounds; and one-quarter load,
312-1/2 kilowatts, 20.8 pounds.

[Sidenote: _Exciter
Engines_]

The two exciter engines are each direct connected to a 250 kilowatt
direct current generator. Each engine is a vertical quarter-crank
compound engine with a 17-inch high pressure cylinder and a 27-inch
low-pressure cylinder with a common 24-inch stroke. The engines will
be non-condensing, for the reason that extreme reliability is desired
at the expense of some economy. They will operate at best efficiency
when indicating 400 horse power at a speed of 150 revolutions per
minute with a steam pressure of 175 pounds at the throttle. Each
engine will have a maximum of 600 indicated horse power.

[Sidenote: _Condensing
Equipment_]

Each engine unit is supplied with its own condenser equipment,
consisting of two barometric condensing chambers, each attached as
closely as possible to its respective low-pressure cylinder. For each
engine also is provided a vertical circulating pump along with a
vacuum pump and, for the sake of flexibility, the pumps are cross
connected with those of other engines and can be used interchangeably.

The circulating pumps are vertical, cross compound pumping engines
with outside packed plungers. Their foundations are upon the basement
floor level and the steam cylinders extend above the engine-room
floor; the starting valves and control of speed is therefore entirely
under the supervision of the engineer. Each pump has a normal capacity
of 10,000,000 gallons of water per day, so that the total pumping
capacity of all the pumps is 120,000,000 gallons per day. While the
head against which these pumps will be required to work, when assisted
by the vacuum in the condenser, is much less than the total lift from
low tide water to the entrance into the condensing chambers, they are
so designed as to be ready to deliver the full quantity the full
height, if for any reason the assistance of the vacuum should be lost
or not available at times of starting up. A temporary overload can but
reduce the vacuum only for a short time and the fluctuations of the
tide, or even a complete loss of vacuum cannot interfere with the
constant supply of water, the governor simply admitting to the
cylinders the proper amount of steam to do the work. The high-pressure
steam cylinder is 10 inches in diameter and the low-pressure is 20
inches; the two double-acting water plungers are