Volltext: The Psychological Laboratory of Cornell University (43)

NOTES AND DISCUSSIONS 
299 
from the ceiling and the floor; it is not even connected to them by nails. The 
partition is held in position by being nailed to the heavy layers of hair-felt, which 
in turn are nailed in place. The flooring and the ceiling between the two sides of 
this wall are broken, as shown in Fig. 3, so that they will not transmit vibrations 
to the inner room. The ceiling is isolated by means of a 16-in. layer of sawdust, 
lath and plaster, and a layer of insulite. The floor upon which the inner room 
is built is isolated from the room below by means of ceiling boards, lath and 
plaster, 16-in. joists and air spaces between them, rough flooring, hard wood 
tongue-and-groove flooring, and sheets of slater’s paper. The construction of the 
side walls is shown in Fig. 4. Overlapping sheets of slater’s paper are spread over 
the stone wall; then there is a 2-in. air space and a layer of insulite. 
Fig. 5. Detail op the Floor-Supports of the Soundproof Room 
The inner room is completely surrounded by an air-space. A 4-in. air-space is 
left between ceilings and, as shown in Fig. 2, between the walls on three sides. 
On the fourth side there is a 4-ft. passageway. The floor studding of the inner 
room rests upon five 4 x 6 in. joists—only two of which are shown in Fig. 3—which 
in turn rest in felt and metal gutters. The detail of these gutters is shown in 
Fig. 5. Four layers of one-inch hair-felt separated by sheet-iron valleys support 
the joists. The purpose of the felt and metal gutters—as of the entire floor con¬ 
struction—is to eliminate vibrations. Across the 4x6m. joists is a layer of 
insulite, and over that is placed a second set of joists (2x6 in.) at right angles to 
the first. The outer wall and ceiling of the inner room are supported by these 
joists. They also support, by means of rope hammocks made of 1 /2 in. hemp rope 
and held in position by staple irons, a third and parallel set of joists, which in turn 
support the floor and the inner walls and ceiling. The floor is made of tongue- 
and-groove hard wood. The space between the floor and the insulite sheeting 
nailed to the other side of the second set of joists is filled with sawdust. The 
outer and inner walls and ceiling are covered with insulite, and the spaces between 
them are also filled with sawdust. The room is to be lined with a sound absorbent 
and the floor covered with cork-linoleum and rugs.
	        
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