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for free. This is an OCR edition with typos. Excerpt from book: II.
EXPERIMENTS ON THE RELATIVE INTENSITY OF SUCCESSIVE, SIMULTANEOUS,
ASCEND- ING AND DESCENDING TONES What has preceded seems to deal
with the physical principles of constant rotation and of tone
production rather than with the psychological properties of tones.
However, in psychology as in the other sciences the time has passed
when it is possible to perform fruitful experiments on new problems
with apparatus that was designed for other problems and that is now
listed in the catalogs of dealers in psychological apparatus. When
the apparatus had been developed to the point at which it seemed
profitable to begin the psychological experiments for which it had
been designed, it was decided to begin with the simplest of tone
intensity problems. This seemed to be the influence of the method
of presentation upon the intensity relations between tones. At the
close of the experiment the "simplicity" was decidedly less simple
than it appeared to be at the beginning. The reason why it was
necessary to restrict the experiment to the relative intensity
instead of working with absolute intensities and then from these
deriving the relative values, was mainly due to the fact that no
absolute standard which could be used was available. The Bureau of
Standards at Washington does not furnish a tone of unit intensity
which may be used as a standard. Professor A. G. Webster has
defined a standard of tone intensity but to calibrate the
intensities used in this experiment in terms of this standard would
require an interferometer and a degree of technical skill in the
manipulation, which would require months to develop. A simpler
device is needed. The writer hopes, in the near future, to design
an electrically driven fork which may be used as a standard for
tone intensities which will be sui...
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