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438 Transactions of S.M.P.E., Vol. XI, No. 31, 1927
are viewed with the unaided eye.^°^ A film has been completed which is said to have met all expectations. ^°^
A patent has been issued upon another means of stereoscopic projection which employs two screens placed at opposite ends of a hall. The spectators can see directly only one screen and are provided with a viewing means which enables them to register the two sets of images. ^°'^
It is said that a stereoscopic illusion is attained through the use of the so-called "magnascope." Another feature of this device is that a picture 30X49 feet in size may be projected. ^°^
A motion picture screen composed of small glass particles has been installed in a New York theater and is said to give an illusion of depth with ordinary projection. ^°^
In an amusement park in Berlin, still and motion pictures have been projected on a curtain of spray from jets of water, giving an illusion of relief .^^°
Talking Motion Pictures
A new device for projecting talking pictures is called the Filmophone. A selenium cell is used to convert the light to electrical energy; the film can register oscillations of a frequency of 10,000.^"
The Photophone is to be sold direct to theaters. Concentration of effort will be directed upon music scores for accompanying films. Synchronized scores will be made for features from all companies who will cooperate to the extent of furnishing a print for screening. Thus, even the smallest of theaters may have excellent musical entertainment with their pictures. ^^^
Two other sound synchronization devices about to be made available are the Vocafilm^^^ and the Orchestraphone.. The Orchestraphone is designed primarily for small theaters and was recently given a trial in a Chicago theater.^ ^^
The effect of the spreading of the image due to irradiation on the sound record in the case of talking films has been reported. ^'^
In Vitaphone productions, the synchronization of sound recording and picture taking is constantly checked by a stroboscopic apparatus employing a sector disc and a Neon tube. A loud speaker is also used in the recording room to check the quality of electrical "sound" fluctuations. ^^^
Trick Cinematography , An interesting paper was presented before the last meeting of the Society describing various methods of obtaining illusions in cinematography. The different technical, artistic, and dramatic problems