Richardson's handbook of projection (1930)

Record Details:

Title:
Richardson's handbook of projection
Date:
1930
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000158
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
August 01, 2024
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1082 HANDBOOK OF PROJECTION FOR same horns when they are each angled in toward the center fifteen degrees. Broken lines H H and G G represent the beam outlines under this condition. At first glance it may seem that there would be slight difference in effect as between the two settings. However, a closer study of the diagram will, I think, convince you that the angled horns will give a decidedly better distribution of sound, or that they at any rate should do so. You will note, for example, that with the horns set straight, the acoustic axis of both are parallel throughout the auditorium, and only a short distance apart. Naturally the greatest volume of sound will be nearest the acoustic axis of each horn, hence it follows that with such a setting the greatest volume of sound would be concentrated in the center of the auditorium throughout its entire length. With the horns angled, however, you will observe that beyond point X X the greatest volume of sound is distributed over a considerably greater area. In Fig. 401 no attempt has been made to indicate the best possible setting for an auditorium of that shape and dimensions. It has only been intended to illustrate the general effect of angling the horns somewhat in toward the center, so that their "beams" cross each other.