Motion Picture News (Mar-Apr 1923)

1208 Motion Picture News usiness fe rings W« bay opera chairs, projection machines, compensarcs, generators and all new or used theatre equipment. Movie Supply Company, 844 South Wabash Avenue. Chicago. 111. Equipment Wanted — Motor Generator Set or Transverter (50), Ventilating and Wall Fans, Frames and other equipment, all guaranteed in Al condition. What have you and price? L. J. Dunning, Warsaw, Ind. New theatre chairs at mail order house prices; J2.20 up; save 20% for best veneers and standards. Get booklet. Western Seating Company, 6455 Bosworth, Chicago. MOTION PICTURE EXECUTIVE, NATIONALLY KNOWN TO TRADE desires connection with a large film producing or distributing company, or large theatre chain, where initiative, hard work and fifteen years' experience in the motion picture industry are needed and appreciated. Address Box A, care Motion Picture News, 752 South Wabash Avenue, Chicago, 111. BUYS, SELLS OR LEASES THEATRES FOR YOU I hare a large list of clients for large and small theatres. Quick reliable action assured. HARRY LAZARUS REALTOR A BUSINESS BROKER 37 TEN EYCK BLDG. ALBANY, N. Y. RadiO^-;-;Mat o <— < LU TALK from your screen WITH your quickly TYPEWRITTEN MESSAGES. 50 RADIO-MATS $2. WHITE, AMBER or GREEN. <=> O «* Accept no substitute. L J • is the Stationery of the Screen ERTEL PROFESSIONAL MOTION PICTURE CAMERA A complete equipment of camera and tripod ready to use, price $150.00. Dozens of other bargains in the new Bass Book of Cinema Apparatus. Send for your copy. BASS CAMERA COMPANY 111 N. Dearborn Street Chicago Fundamentals of Light for Cinematography (Continued from page 1204) on the screen, but that the point of illumination which is above the original point of illumination is reproduced below the point of the original point of focus of the first point. If we now move this screen closer to or farther away from the lens, we find that the point of light enlarges in a circle of illumination. This is termed the circle of confusion. By moving the screen back and forth we also find that there is only one position in which the points of illumination are perfectly reproduced. If, however, we now move one of these points of illumination to a much greater distance than the other, we find that while one is sharp and distinct the other forms a small circle of confusion and that when we move the screen so that the more distant one is in focus, that the other becomes a circle of confusion, or out of focus, as it is termed. If, however, we move the two points closer to one another, but still at different distances from the lens, we find that we can bring them both to a focus on the screen or rather, so nearly to a focus that the eye is not able to distinguish the difference in sharpness between the two. This difference of distance between the two points of illumination is called the depth of focus Let us now take the points of illumination, as in Fig. 13, with one of the points focused sharply. If now we interpose a piece of black cardboard, in which a small round hole has been cut, close to the lens so that this hole is near the center of the lens, we find that the brightness of the images is much decreased but that the image of the point which was out of focus is now much sharper. Let us refer to our Fig. 13. Our images are not nearly so brilliant because much of the light which formerly came through the lens has been cut off by the piece of black cardboard; but as the cardboard has narrowed down the angle which the light ray takes from the lens to the focal plane, we have narrowed down or made smaller, our circle of confusion. (To be continued:) Broadway , Statesville, N.C., Being Remodeled K. E. Spencer, formerly of Monroe, N. C, lias purchased the Broadway, Statesville, N. C, from W. D. Vanderberg. Mr. Spencer immediately closed the house for extensive alterations. The screen formerly in the front will be put in the rear, and the entire seating plan rearranged to give one hundred more seats. — Bain. T^JS all Kinds V?5p^ Write for Samples "WELDON.WI HUMS b LICK PORT SMITH, ARK. Costs Less Now to Have Color Electric Signs Reco Color Hoods have been greatly lowered In price. Reco Color Hoods snap on or off any bulb; Instantly makt It colored. Writ* for bulletin. Mfrt. of Reco Motor*. F lath en. et». 2628 W. Congress St., CHICAGO Theatre and Exchange Mailing List Service We rent lists of or address contemplated of existing theatres, exchanges, state rights owners, publicity mediums and producers, selected as to territory, class, etc Twenty thousand changes were recorded in our list last year. Its use means a saving of from 20 to 50% In postage, etc MOTION PICTURE DIRECTORY CO. 244 West 42nd St. Phcni. Brymnl 8/38 New York iddretsing Printing TYPHOON COOLING SYSTEM TYPHOON FAN CO. »*• 345W.39' ST. • NEW YORK FOR BETTER MUSIC THE FOTOPLAYER THE AMERICAN PHOTO PLAYER CO. 1600 B.ROADWAY 702 SOUTH WABASH AVENUE 109 GOLDEN GATE AVENUE NEW YORK CITY CHICAGO. ILL. SAN FRANCISCO, CAL.