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1954-55 Theatre Catalog, 12th Edition, Page 264 (228)

1954-55 Theatre Catalog, 12th Edition
1954-55 Theatre Catalog
1954-55 Theatre Catalog, 12th Edition, Page 264
Page 264

1954-55 Theatre Catalog, 12th Edition, Page 264

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The final step in lacing is to install additional ties through the grommets at each end of all seams, tightening them sufficiently to remove seam wrinkles. (This is extremely important as it is the only way the puckers formed in sewing may be removed.)

Detailed instructions are packed with each screen, and may be changed from time to time as experience may dictate; the procedure outlined here will, however, produce a smooth, perfectly hung screen. Do not use springs, rubber bands, or any heavier lacing cord than that supplied. The grommets are carefully installed, and as the tension is increased on the cord, the vinyl binding will first deform, then the' grommet should pull out, before the screen material tears, or the sewing fails. This is done deliberatelysit is better for a grommet to pull out than to ruin a screen. When the vinyl binding shows marked deformation around the grommet, the cords are tight enough.

It is absolutely impossible to hang a screen smoothly on a light, flimsy frame that bends faster than the cords can be tightened, If seam wrinkles persist and the frame is of light construction, check the members for bending. Instructions similar to the above will be packed with the Astrolite screen.


Magnetic sound tracks are recommended with CinemaScope principally

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because of the simplicity of the reproducing equipment and for the better technical performance which is required due to the use of somewhat narrower tracks and the demands of stereophonic sound. Stereophonic recording requires that at least three tracks be used and extreme difiiculty would be experienced in maintenance of the theatre sound equipment if optical systems, exciter lamps and photocells were ,to be kept within narrow performance limits relative to each other. Magnetic sound, of course, has its own peculiar problems in the field and some of these will be discussed in the following material. In general it can be said that with reasonable care and under the customary circumstances in projection booths, the use of magnetic tracks need cause no alarm. Although tests of magnetic film have been made to determine its susceptibility to erasure or the introduction of noise by deliberate exposure to the usual electrical apparatus such as transformers, motors, generators and rectifiers and no serious effects have been found, it is wise to avoid subjecting the magnetic tracks to strong electric fields. If the handling is confined to the usual rewinds, carrying cases and projection apparatus, it is not expected that magnetic film will suffer any more from field use than optical tracks do in their particular way. Obviously, by deliberate intent, magnetic tracks could be ruined but for this matter, so can optical tracks.





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Most CinemaScope single film releases will provide three principal tracks for the stereophonic sound and a fourth track of somewhat lesser but adequate technical performance for effects which are .to be supplied to the auditorium, or surround, loudspeakers, The magnetic tracks are also depicted in Figure 3.

Loudspeaker Systems-Screen

The three loudspeakers should be identical types and of approximately the same sensitivity. The reason for this is obvious if the reader will consider that the voice quality of an actor should not change unnaturally as he moves across the screen. In order that the studio Sound Department may record the dialogue or sounds in their proper space relation within the picture frame, it is important that the loudspeaker locations within the screen frame be known. This fact demands standardiaztion of speaker locations and for CinemaScope release we have adopted the standard that the center-to-center distances between loudspeakers shall be equal to one-third of the screen width. Another way of stating the same specification is that with the CinemaScope aspect ratio of 2.55 to 1, the center-to-ccnter distances between loudspeakers shall be 0.85 times the picture height. In cases where there is a serious physical limitation, this specification can be modified by 10 per cent but preferably to the wide spacing rather than a narrow spacing. The cen TH EATRE CATALOG 1954-55

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1954-55 Theatre Catalog, 12th Edition, Page 264