rays.

[Sidenote: _Lighting of
the Power
House_]

For the general illumination of the engine room, clusters of Nernst
lamps are supported from the roof trusses and a row of single lamps
of the same type is carried on the lower gallery about 25 feet from
the floor. This is the first power house in America to be illuminated
by these lamps. The quality of the light is unsurpassed and the
general effect of the illumination most satisfactory and agreeable to
the eye. In addition to the Nernst lamps, 16 c. p. incandescent lamps
are placed upon the engines and along the galleries in places not
conveniently reached by the general illumination. The basement also is
lighted by incandescent lamps.

[Illustration: SECONDARY DISTRIBUTING SWITCHBOARD AT PASSENGER
STATION]

For the boiler room, a row of Nernst lamps in front of the batteries
of boilers is provided, and, in addition to these, incandescent lamps
are used in the passageways around the boilers, at gauges and at water
columns. The basement of the boiler room, the pump room, the
economizer floor, coal bunkers, and coal conveyers are lighted by
incandescent lamps, while arc lamps are used around the coal tower and
dock. The lights on the engines and those at gauge glasses and water
columns and at the pumps are supplied by direct current from the
250-volt circuits. All other incandescent lamps and the Nernst lamps
are supplied through transformers from the 60-cycle lighting system.

[Sidenote: _Emergency
Signal System
and Provision
for Cutting Off
Power from
Contact Rail_]

In the booth of each ticket seller and at every manhole along the west
side of the subway and its branches is placed a glass-covered box of
the kind generally used in large American cities for fire alarm
purposes. In case of accident in the subway which may render it
desirable to cut off power from the contact rails, this result can be
accomplished by breaking the glass front of the emergency box and
pulling the hook provided. Special emergency circuits are so arranged
that pulling the hook will instantly open all the circuit-breakers at
adjacent sub-stations through which the contact rails in the section
affected receive their supply of power. It will also instantly report
the location of the trouble, annunciator gongs being located in the
sub-stations from which power is supplied to the section, in the train
dispatchers' offices and in the office of the General Superintendent,
instantly in