88
ARCHITECTURAL ACOUSTICS
temperature room mentioned in the previous papers. The arrange¬
ment of apparatus is shown in Fig. 3, where the air reservoir in the
room above is shown in dotted lines. In many respects the constant-
temperature room offered admirable conditions for the experiment.
:
Eig. 3
Its position in the center of the building and its depth underground
made it comparatively free from outside disturbing noises, — so
much so that it was possible to experiment in this room in the earlier
parts of the evening, although not, of course, when any one else was
at work in the building. While it possesses these advantages, its