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ACOUSTICS 97
construction. The sound-absorbing qualities of all modern building materials are well known. Therefore, it is possible to measure the acoustical effect mathematically and with exactness and to design interior finishes which will bring about the desired improvement in the auditory properties.
The customary method employed in securing sufficient absorption is to introduce the requisite amount of felt for the auditorium under treatment. The surfaces that are so treated are afterward covered and protected with a decorative fabric. The choice of the quality of the fabric depends a great deal on the treatment necessary. A special fabric coating is used, generally, in order not to affect the absorption quality.
Acoustics may be improved, when properly handled, without mutilation of the architectural design. Frequently, good results may be obtained by changing the shape and contour of walls and ceilings. If this is done properly the installations can be effected without interfering with the decorative value of the theatre. The treatment by means of the absorbing materials must necessarily be entrusted to experts, because the degree of reverberation should be determined only after technical analysis and because it depends to a great extent on the type of room or auditorium to be altered. Finally, sounding boards are frequently of value in bettering acoustical conditions. When properly designed and blended into the decorative treatment of the theatre they may prove of great value.
Most motion picture theatres are sufficiently good acoustically for the satisfactory audition of incidental organ and orchestral music, but there are many that are too reverberant for the comfortable audition of speech. If speech is to be heard with ease and comfort each syllable must stand out clean cut and distinct, particularly when sound is introduced in connection with motion pictures.
All sounds of speech and music are complex in nature.