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In all I noticed that the prevailing tint
was green.
"I had experiments carried out," he explained languidly, "with the
object of discovering methods and means for rendering walls and
ceilings capable of effective resistance to sound transmission.
One of the methods devised involved the use under the ceiling or
parallel to the wall, as the case might be, of a network of wire
stretched tightly by means of pulleys in the adjacent walls and
not touching at any point the surface to be protected against
sound. Upon the wire network is plastered a composition formed of
strong glue, plaster of Paris, and granulated cork, so as to make
a flat slab, between which and the wall or ceiling is a cushion of
confined air. The method is good in two respects: the absence of
contact between the protective and protected surfaces and the
colloid nature of the composition used. I have gone into the thing
at length because it will make all the more remarkable what I am
about to tell you."
Kennedy had been listening attentively.


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