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1954-55 Theatre Catalog, 12th Edition, Page 320 (284)

1954-55 Theatre Catalog, 12th Edition
1954-55 Theatre Catalog
1954-55 Theatre Catalog, 12th Edition, Page 320
Page 320

1954-55 Theatre Catalog, 12th Edition, Page 320

screws will bring the images together vertically. Turn the screws one at a time and watch to see the effect on the screen. Now bring the images together horizontally, by using the sizes as reference, and vertically by using the top as reference. When there is perfect alignment both on top and sides, tighten the set screws so that the unit is locked in the right position.

Centering Images

Now that the images are aligned relative to each other, the resulting double image must be lined up on the screen vertically and horizontally. Raise or lower the aperture images, by using the adjusting screws. These screws work against each other and should be used gently. A very small adjustment will move the image a large distance on the screen. To lower images, loosen the top screw and tighten the bottom screw, watching results on the screen. When images are located properly tighten the top screw.

To move the images right or left on the screen, use the adjusting screws. The wing nuts must be loosened when making this adjustment. To move the image to the left, loosen the wing nuts and tighten screw about half a turn. Tighten the wing nuts. The aperture images will no longer be together.

Now loosen the set screws and repeat the alignment procedure. You should now find that the perfectly aligned aperture images are now further to the left. Repeat this sequence of operation until you are satisfied with the picture location.

Test with Loop Chart

It is now time to use the loop chart film. The two images should be perfectly superimposed on each other. If they are off sideways, turn your regular framing device until they overlap. If

NATURALLY, only time will tell whether audiences will once again accept three'dimensional films, such as the one seen here. Many of the problems

they are off vertically, loosen the set screw, adjust and re-tighten.

Look into the aperture to determine how to put in the film without future need for framing. Then focus the 3-D film exactly as you would for a 2-D print. Once the Pola-Lite unit is focused for 3-D it is not necessary to refocus for a regular 2-D show.

A certain amount of light may overspill the bottom of the screen. This looks like a reflection of the picture. To eliminate this overspill, take a piece of shim stock, about .008 inch. thick, and cut two pieces four and three-quarter inches long, and about one inch wide. Now trim the width to suit your particular installation so that when placed in the lower slot behind each filter, the shim blocks off the overspill from the particular window. Be sure the upper edge of the shim has no burrs.

Check Filters

The Pola-Lite filters are supplied in a box containing four sets. It is advisable that a new set of filters be used for each new 3-D engagement.

When inserted on the unit see that the arrows on each filter point towards each other.

To project 2-D programs when the Pola-Lite unit is on the projector, it is only necessary to lower the center prism of the unit. This is done accordingly: On the bottom of the unit there are two wing nuts; screw these wing nuts off and pull down the two stud rods.

The entire unit remains on the projector. The prism unit remains hanging on the stud rods protected by the bellows. Change back to the regular aperture and everything is now restored for the projection of a normal program.

To change again to 3-Diprojection, change the aperture, push back the prism unit, tighten the two wing nuts. Do not

single-strip systems.

misplace the wing nuts. Be sure to tighten these nuts before starting the 3-D performance.

Some Suggestions

The lens barrel must project out of the projection head. If a theatre is operating with the lens totally inserted into the projection head, then the exhibitor must secure a couple of "lens bars relle These are readily available at local supply dealers.

If, when the images are superimposed on the screen, the upper edge of the light from the left hand window is above the upper edge of the light from the right hand window, then remove the aperture and file down the right hand side of the aperture opening, dressing the edge carefully to remove burrs. Do this very carefully until the edges are superimposed. In case the right hand image is higher tile the left side of the aperture opening.

Pola-Lite prints and the Pola-Lite system are developed for a ratio of 1.77 to 1 picture. Many theatres maintain their present lens with Pola-Lite although height and width of the picture is reduced. For this reduced size picture it is suggested that the screen be masked on the top and sidesethis will give an adequate picture. Other theatres wishing to compensate for this slightly reduced picture size may do so by using a shorter focal length lens,

To protect the Pola-Lite 3-D unit, once the attachment is removed from the projection machine, it is suggested that you replace the filters by the cardboard slides with which the unit was originally supplied, and then keep the unit in the specially constructed carton in which it was delivered, With some lens tissue in the barrel opening, you can securely protect the unit from dust and possible breakage.

which were found in the two projector method are eliminated with the It is now up to the public to make its decision.

1954-55 Theatre Catalog, 12th Edition, Page 320