We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
ioo SOUND MOTION PICTURES
large scale, the reflected sound will be scattered and broken up and its definite or articulate character destroyed. Then what we have is called reverberation.
The lapse of time before an echo is heard is due to the greater distance it travels as compared to the path of the original. This difference of path may be such as to cause much mischief; for the reflected sound of a spoken syllable or of a note of music may, and often does, arrive at the ear at the same moment as the succeeding syllable or note which has travelled by the direct path and so cause hopeless confusion.
Smooth, hard-finished walls, such as the usual plastered type, are excellent regular reflectors of sound and are consequently likely to produce echo. It becomes of importance, therefore, to break up such surfaces in order to produce irregular distribution of the reflected sound. The scattering in the case of ceilings is usually accomplished by what is called "coffering." Examples may be seen in many theatres of modern construction. The ceiling and perhaps the proscenium arch are broken up into depressions about four feet square, containing a succession of steps totalling a depth of, perhaps, eight or ten inches. An irregular surface of this character breaks up the reflected sound and distributes it in such a way as to minimize echo and, in fact, to convert it into reverberation. The dimensions which should be assigned to such coffering are not a matter of taste or accident. If the wave length of the incident sound is very large compared to the size of the irregularities it encounters there will be little dispersive effect produced ; while, if it is very small, the smooth spaces inside the coffering may act as regular reflectors.
In addition to their own damage reflection produces other evils known as "dead spots and sound foci." Sound travels through the air as a wave of alternate compression and rarefaction, or contraction and expansion. If a reflected