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THREE-DIMENSIONAL MOTION PICTURES 97 film consumption would be decreased and film maga zines reduced in size or else hold a much longer record. This procedure, however, is impractical, first be cause the resolving power of photographic emulsions of adequate speed is insufficient to permit a satisfac tory screen image to be obtained by such a process. Graininess would be very pronounced and detail would be lost. It would, furthermore, be impractical in the present state of development of the optical systems em ployed in the sound-on-film processes since it would be impossible to get a satisfactory reproduction of sound because of the loss of high frequencies. Finally, it is not at all sure that such a picture could be projected with anything like a satisfactory degree of brightness. A modification of this solution was demonstrated at the meeting of the Optical Society of America at its meeting in Washington in November, 1928, which is interesting enough to justify examination. You have probably all observed that if you had a telescope of any kind before your eye in a reversed position all objects seen through it are apparently reduced in size and look more remote. If you hold a telescope before the lens of your camera you will be able to observe the same effect on the ground glass. If the telescope be held before the camera lens in its ordinary operative condi tion the image on the ground glass will be larger than the image formed by the camera objective alone. To be more specific, if we hold a 2X Galilean telescope in front of the camera lens with the objective lens of the telescope facing the camera as shown in the diagram the size of all the individual details in the image on the ground glass will be just half as large as they are with out the telescope. If you try this experiment do not be surprised, however, if the total image fails to cover the whole ground glass area; the ordinary Galilean telescope optics serve only to demonstrate the principle but will