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1954-55 Theatre Catalog, 12th Edition, Page 217 (181)

1954-55 Theatre Catalog, 12th Edition
1954-55 Theatre Catalog
1954-55 Theatre Catalog, 12th Edition, Page 217
Page 217

1954-55 Theatre Catalog, 12th Edition, Page 217


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curve on a particular job. For example, as a result of exhaustive tests made at our plant we have found it impractical to accept jobs where the radius of the curve is less than 33 feet, or where there is more than one radius on an individual traverse. The latter condition poses a complicated problem because the structure of many of the prosceniums in

SEEN IS A section of the Silent Steel track and carrier assembly. Requires less packing space.

our nations theatres make it mandatory that the curved track parallel the side walls, which of course means a comparatively sharp turn near each track end as the side walls are approached. With our principle of two balanced wheels rolling on two parallel treads one can understand our apprehension as the carriers approach and roll along such incongruous curving. What happens is that. the cord is trying to move on a straight. bias and this tension naturally causes our balanced carriers to buckle and foul. One solution to this problem would be to cut through the side walls to assure one consistent radius; however, this is more often than not both economically and structurally inexpedis ent. Oftentimes an overhanging balcony prevents the allocation of sufiicient space for continuation of the curved track.

A DRAWING of the recently developed backpack guides and the method of attachment used.


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SEEN HERE is a panoramic View of the No. 310 curved track. You will note that the arc, the chord and the rise are clearly indicated here.

By the term radius we mean the straight line drawn from the center of a circle to the outer surface of the circle. It is sometimes possible to find an installation where the curve radius

A SECTION of the Besteel track and carrier assembly. It is now available for curved screens.

is well beyond our 33 feet minimum but the curve is still too sharp for us to guarantee a satisfactory operation. As an example, if a horizontal line were drawn between two hypothetical curved track ends, let us assume that line

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measures 60 feet long; if a line were drawn between the center of that point to the center of the curved track, let us assume it measures 20 feet. This would indicate that the former figure (60 feet) is three times the latter figure (20 feet). However, as a result of tests made at our plant we have found it infeasible and inadvisable to accept jobs where the former figure (called the Chord) is less than three and one-half times the latter figure (called the Rise). In connection with curved tracks our employees are now well versed in using such terms as Rise, Chord, Radius and Arc (represented by the curved track itself). Particularly the Rise and Chord are essential dimensions to be furnished for proper processing of curved track orders. Certain formulas involving theSe dimensions have been devised, the most useful one being where the Chord and Rise are known and where the Radius must be ascertained: Radius = (Chord):' + Rise' ( 2 ) 2 X Rise

Given a Chord of 40 feet with a Rise of 24 inches, a typical CinemaScope installation, what would be the Radius?

(40)3 + (2)2

( 2) = 400 + 4 = 101 feet

2 X 2 4

(well above our minimum figure) With the Radius definitely established along with the Rise and Chord it is then possible to proceed with the fabricating and forming of the curved channel.

Also available now is a curved track

traveler. The carriers furnished with
1954-55 Theatre Catalog, 12th Edition, Page 217