into the large main entrance or entrance crossings where 
it was believed there would be sufficient out leakage to offset 
the fresh air introduced. Recent tests of the systems have 
borne out this belief. Seminars are provided with gravity 
vent ducts and window air supply, in addition to direct 
radiators for heating.
       Automatic temperature control of the pneumatic type is 
provided throughout for control of the temperature of air 
used for ventilation. All principal rooms, such as the Rare 
Book Room, Main Reading Room, and Exhibition rooms, 
and also all seminars are provided with automatic control on 
direct radiators. Small offices and, in general, rooms for special 
collections of books are not provided with air supply or 
exhaust.
       A simple system of sectional control to help eliminate 
overheating was installed for the stack tower and the working 
space of the building. This makes it possible to turn off 
or turn on steam to radiation on the north, east, west, or south 
walls from a central control board.
       A low pressure steam heating system with vacuum return 
lines is installed. Steam for heating is obtained from 
the University's Central Power Plant. Water of condensation 
is saved and returned to the Central Power Plant by 
means of motor driven pumps.

LAWRENCE A. TEASDALE, '10 S.