Symmetrically arranged with respect to the center line of each engine
are the six boilers in the boiler room, and the piping from these six
boilers forms a short connection between the nozzles on the boilers
and the throttles on the engine. The arrangement of piping is alike
for each engine, which results in a piping system of maximum
simplicity that can be controlled, in the event of difficulty, with a
degree of certainty not possible with a more complicated system. The
main parts of the steam-pipe system can be controlled from outside
this area.

The single tier of boilers makes it possible to secure a high and well
ventilated boiler room with ventilation into a story constructed above
it, aside from that afforded by the windows themselves. The boiler
room will therefore be cool in warm weather and light, and all
difficulties from escaping steam will be minimized. In this respect
the boiler room will be superior to corresponding rooms in plants of
older construction, where they are low, dark, and often very hot
during the summer season. The placing of the economizers, with their
auxiliary smoke flue connections, in the economizer room, all
symmetrically arranged with respect to each chimney, removes from the
boiler room an element of disturbance and makes it possible to pass
directly from the boiler house to the operating room at convenient
points along the length of the power house structure. The location of
each chimney in the center of the boiler house between sets of six
boilers divides the coal bunker construction into separate pockets by
which trouble from spontaneous combustion can be localized, and, as
described later, the divided coal bunkers can provide for the storage
of different grades of coal. The unit basis on which the economizer
and flue system is constructed will allow making repairs to any one
section without shutting off the portions not connected directly to