upon a curved or concave screen rise from the floor
when the picture is tilted, a bottom masking with a
curved top is indicated for such tilted installations.
However, since the public has been accustomed to the
straight lines of present maskings and the curved
masking presents several additional problems, the
bottom masking may be installed level in most instances provided it does not mask essential portions
of the center of the picture upon which it must encroach.
The side maskings should be adjustable in
width, possibly with a stiffened leading edge - to
close in to mask the sheet for conventional pictures,
and to open up to mask the sheet for the CinemaScope picture.
This may be done by supporting the side masking on tracks with suitable stops on the tracks and at
the floor, or by other means, as may be devised by the
engineer or the purchaser.
For this purpose, and for the use of close-in
curtains, curved tracks are available from the supplier.
CLOSE-IN OR SCREEN CURTAIN
(Not included in CinemaScope Package)
In all cases a curtain, and including a valance,
should be employed, if for no other reason than to
keep the screen clean.
The curtain may be mounted on a curved or a
straight track as may be indicated, and can be used
for a side trim or false proscenium where required or
desired, or extended with fixed tabs at each end to
form a transition between picture and the house decoration.
The stereophonic sound system, basically an
integral part of the CinemaScope system, consists of
an element to be attached to the projection head at
its intersection with the upper magazine, designed to
pick up the magnetic tracks of the picture film, together with the necessary pre-amplifiers, matched
amplifier and speaker assemblies with monitor and
other associated equipment.
The operation of this element will be controlled by switching arrangements as will the photographic
pick-up in the present sound head, permitting them to
operate independently of one another as desired.
Since, in addition to the three primary magnetic
sound tracks required for stereophonic sound, CinemaScope picture film will be supplied with a fourth
effects and control track, some theatres may wish at
their own election to extend the range of participation
or effect into the auditorium where an additional preamplifier and amplifier will be required, together with
a number of house speakers as may be indicated by
The Amplifiers: In every case, the amplifiers
provided for stereophonic sound must match, but
should the present amplifier be entirely suitable, it
may be retained and two identical amplifiers added to
complete the basic requirements of CinemaScope.
Should it be unsuitable, its use for auditorium
speaker use should be assessed, and three perfectly
matched units installed.
Speaker Assemblies: In every case, the speaker
assemblies must match, but should the present
speaker assembly be entirely suitable, it may be retained and two identical assemblies added to complete the basic requirements of CinemaScope.
Should the speaker assembly be unsuitable, then
three matched units must be installed.
The suitability of the amplifiers and the speaker
assemblies and the ability to match them must be determined by the equipment-supplying engineers after
their survey of the theatre.
The three speaker assemblies will be mounted
in the usual manner back of the screen, one upon the
center line, the other two on the center line of each
outside one-third of the picture, i.e., at W/3 each
side of the center line and as close to the screen
surface as practicable. Proper mounting is extremely
important if the maximum effectiveness possible with
stereophonic sound is to be attained throughout the
No braces or other obstructions in the frame
construction should be permitted to be installed immediately in front of these assemblies.
For additional definition of W/3, consult the
screen frame drawings included in this manual.
* * *