has provided a switchboard
through which any outlet may
be connected to any other outlet in
the building, or to the
There is a clock system consisting of a master clock,
secondary clocks, time stamps, an employees'
time recorder, and
bells for giving warning of the closing
time of the library.
This system is operated from a storage
battery which is kept
On account of the large area of the bookstack, signal
lamps in groups of three have been
installed at several places
in the aisles on each floor. The location
of these lamps was
so chosen that the attendant can see
one or more of the groups
from any point in the main aisles.
The lamps indicate the
arrival at the floor of one or both
dumb-waiters, one or both
elevators, or a carrier with call slips
via the pneumatic tube.
The building is provided with six elevators and two
dumb-waiters, all driven by electric
motors. This apparatus
is of the most modern design and construction.
Two of the elevators carry operators and are used by
passengers to the special collections
and seminar rooms;
they run from the basement to the seventh
floor and can carry
2,500 pounds at 450 feet per minute.
The winding machines
are of the gearless traction type.
The car gates and well
doors are hand operated, and the well
doors have door
closers. The system of control is that
known as unit
multivoltage control with hand operated
switches in the cars
which give smooth and quiet operation.
Two of the elevators are used principally for returning
books to the shelves. These elevators
have full automatic
push button control; there is a group
of buttons outside the
well at the first floor for each car
by means of which the car
can be called to that floor from any
point in the well, if not
in use, and can be sent from the first
floor to any other floor.
There is a similar group of buttons
in the car by means of