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Pola-Lite glasses are shown above in the three models available for adults and children who do not wear correction glasses to see the picture, and lor adults who do. All are of plastic construction with the filters crimped into the frame. The clip-on type has small knobs which effect easy attachment to spectacles.
Of stiffened cardboard construction, the Magic Vuer glasses pictured at right have full-vision filters with a dark surround to aid viewing, while temple bars are designed to prevent back reflections. The fold of the bows creates a slight tension for firmness in place.. Adult bow types include one (upper right) with plastic bow extensions for extra firmness. A clip-on type is at lower left. The juvenile size above it has frames with intriguing space-cadet pictures.
films back into synchronization. And the cost, considering the function, is nominal.
Light sources also have been often inadequate. Many of the high-intensity installations using suprex carbon trims were already being operated at least close to capacity for 2D pictures; 3D brought about replacement with larger lamps, but that was far from the usual thing. Moreover, 3D is exacting in its brightness requirements: it causes a diminution of objects which reduces acuity, while overall detail is important to a full rendering of the third-dimensional effect. Gradually, installation of more powerful light sources and faster lenses, with the prospect of widescreen further encouraging it, has made
many more theatres able to apply the twostrip method effectively.
Then, among critical factors, there were the early spectacles. Considering the way the little stranger was sent into the house, only dimly announced and through the back door, it is understandable that not much money was risked on accessories for a long visit. The first glasses were delicate cardboard affairs.
They were odd things to a movie patron. How do you put ’em on? Not knowing, they bent the paper bows in the wrong places, and in trying to keep the things on, put finger marks all over the filters, which were scarcely big enough to see through anyway. Sweating somewhere between con
fusion in the projection room, a picture going awry on the screen, and an audience fumbling with glasses, many an exhibitor began to think, “Even if it was good, I wouldn’t like it!’’
But this difficulty, too, has been removed from the exhibition of 3D. Throw-away type glasses available today provide an adequate filter area, they are fabricated for firm placement over ears or clipping on the rims of sight correction spectacles, and are available in juvenile and adult sizes.
SINGLE-STRIP SYSTEMS
While the vectographic method has long been under development, the Nord system
BETTER THEATRES SECTION
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