Reel and Slide (Mar-Dec 1918)

REEL and SLIDE 13 PRQJE Any questions pertaining to the projection of films Eind slides on the screen will be answered by this department. Address "Projection," Reel and Slide, Herald Bldg., Chicago. If an answer by mail is desired, enclose stamped envelope. (By The Extension Division, Indiana Universi ty, Public Welfare Service) FOR class room use a small lantern with acetylene burner is quite satisfactory and is the type obtainable at the least cost. Nearly all stereopticon manufacturers make this type. Acetylene comes in small or large tanks obtainable wherever there are automobiles. After acetylene probably the next best non-electric light is the oxyhydrogen or calcium. A special calcium gas-making outfit is required. One method of cutting the projection outlay to a minimum and yet securing the calcium light is to have the generator purchased by the county superintendent, who will circuit it to his schools to be used in place of the acetylene. In some instances county superintendents have purchased the complete equipment, including lantern, allowing each school to use it in turn, but this leaves each school without a lantern for most of the time. If this outfit is purchased the burner should be adapted to the use of the pastil instead of the lime. Where electricity is available the arc or the Mazda lamp should be purchased. County superintendents have in some in stances attached a dynamo to an automobile motor and furnished current for stereopticon arc lamps. This can be done without a rheostat. Purchasers of stereopticons (not motion picture machines or microscopical projectors) should consider the advisability of securing a model which uses, or can use, the high power Mazda light. These lamps are the gas-filled Mazda with concentrated filament especially adapted for projection purposes. They have several advantages over the arc lamp. They furnish an automatic, steadyburning, efficient and economical light. The manufacturer claims that they have a life approximating 200 hours' use. If the bulb burned only one-half its rated life, the cost of operating, including renewals, is probably much less than the cost of an arc light giving the same degree of illumination— there is a saving in current and carbon consumption. The lamp works just as any ordinary electric bulb, turned off or on by a thumb switch, and it is noiseless and steady in operation. With the exception of the 1000-watt lamp, these Mazdas may be attached to any regular lamp socket and require no resistance (rheostats, etc.,) on circuits of 110 to 115 volts. For 220-volt circuits a resistance is necessary. The following slide sets are announced by the Extension Division of the University of Indiana at Bloomington: After the War— What? 35 slides dealing with the events in the war during the month of October. 1917. U. S. Navy. 50 slides — colored. U. S. Army. SO slides — colored. European War. 50 slides — colored. American History. 13 slides-colored — reproductions of famous marine paintings, which depict thirteen chapters in American history. 5 slides — colored — reproductions of other paintings. Playgrounds (2 sets). SO slides — -colored. 100 slides — plain. (Special attention should be given to play and recreation in war time.) Process of Legislation in Indiana. 30 slides. Indianapolis views. The Tourists' Paris and the Peasants' France. 100 slides — colored. Is it possible to secure a second-hand moving picture projector that is reliable? Answer: Certainly. Many of the big houses have used machines on hand that they will sell at reduced prices. Usually they are completely overhauled before being resold. Question: Can you tell me where I can get Shakespearean pictures that are well produced and accurate? Des Moines. Answer: The Atlas Educational Film Company, 63 E. Adams street, Chicago, lists "A Winter's Tale;" also, you might write to George Kleine, 63 E. Adams street, Chicago. THE OWEN AUTOMATIC isTHE PERFECT STEREOPTICON Size of machine, 19x26x7 inches. Runs continuously, or poses, starts or stops at will. (We guarantee the Owen machine .) I or lecture pur The Owen is what you want and what you need, so write us today for further details about this wonderful improved stereopticon After years of experimenting and the expenditure of much money, we are able to offer a machine that projects, automatically, 50 Standard Slides In Endless Rotation (It starts and stops at will) The possibilities of this machine in lecture work, class room, exhibitions and advertising are unlimited. With it the speaker is freed from the necessity of watching his machine. The appearance of the pictures coming on the screen is the same as that made by a handoperated machine using a double slide carrier. Each picture remains 12 seconds, and its place is then automatically taken by the next slide. We also make to order machines to carry 100 or 200 standard slides. Perfect, clear pictures always. Cost of operation 2 to 5 cents per hour. The machine, complete, includes a 400-watt nitrogen-tungsten projection lamp, condensing and objective lenses and motor (either alternating or direct current). Address ^ THOMAS J. OWEN 4009 Jackson Boulevard, Chicago, 111. We also supply High Grade Standard Lantern Slides for every use. Please say, "As advertised in REEL and SLIDE," when you write to advertisers.