Investigations of the effect of cold working on the
internal friction of copper have become numerous in the last
few years due to the discovery that part of the internal
friction is due to the motion of dislocations in the metal.
Most of the investigations so far have been done...
Sound waves are very convenient for the investigation of
all wave phenomena with the exception of polarization. They are
particularly useful in connection with microwaves because the
latter's wave length can be easily duplicated with sound waves,
making it possible to obtain the same diffraction pattern for
both when confronted...