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Page 242 The Educational Screen Three New Titles m Keystone Series of Geography Units Unit Number 18: Scattered American Lands Unit Number 19: Our Neigh- bors in Eastern Canada Unit Number 20: Our Neigh- bors in Western and Northern Canada Whether you wish to place these Key- stone Units in a school or to send them out from a central bureau, you will find the Teachers' Manual, prepared for each unit by Zoe A. Thralls, of inestimable value in the use of the stereographs or lantern slides. A Sample Teachers' Manual Will Be Sent on Request Keystone View Co. MEADVILLE. PENNA. r>\vners of Neiu Life and Scratch Proof Methods de- cided to manufacture these preparations in con- centrated sohition form which could be ap]3hed by the miniature camera man or amateur movie ■maker to his own fihu. Kin-O-Lux, Inc., New York City, will be happy to send interested readers further information on request. Bell & Howell lOOO-Watt Sound Projector A 1000-\^•att 16 mm. sound-on-iilm talking;' motion ])icture projector for use especially in large audi- toriums with audience capacities of 2000 and more persons, has l^een brought out by Bell & Howell. The picture-projecting component of the new Filmo- sound is, fundamentally, the silent lOOO-watt Filnio auditorium projector, wdiich shows most effective pictures up to 16 feet in A\idth. It was one of these lOOO-watt silent 16 mm. machines that was used re- cently for presenting the motion picture accom- paniment of a lecture given under the auspices of the National Geographic Society in Constitution Hall, Washington, D. C, which auditorium seats 4000 people. Because of the size of the auditoriums in which the new sound picture projector is to l^e used, a separate-unit high-fidelity amplifier of exceptionally high-power output is employed, which is said to fill any average-sized theatre or auditorium. Provision is made for the operation of two film projectors, with the necessary changeover controls. Changeover is made in the sound and picture simul- taneously, by a single control, Spencer Lens Company News Spencer Lens Company announces that negotia- tions have been completed whereby the American Optical Company has acquired a substantial inter- est. H. N. Ott, President of the Spencer Lens Com- pany, states: "With the American Oi^tical Com- pany's one hundred years of experience and success in its field of opthalmic lenses, spectacle frames and mountings, spectacle cases, safety goggles and in- struments and equipment used by oculists, optomet- rists and opticians, to guide and assist, the Spencer Lens Company will be able to progress even more rapidly through enlarged manufacturing resources, and new and important development work. The name Spencer in optics has been synono- mous with cpiality for nearly a century. The pres- ent products of the company comprise microscopes, microtomes, projection and other apparatus, having a wide recognition and acceptance in the scientific world. The business of the Spencer Lens Company will continue to be operated under the same name, poli- cies and personnel, with executive offices and manu- facturing plant at ButTalo, X. Y., as at present."