Motion Picture Herald (Apr-Jun 1931)

94 Better Theatres Section April 11, 1931 STAGE EQUIPMENT ASBESTOS CURTAINS BELAYING PINS BLOCKS— RIGGING CHANDELIER WINCHES CLEATS— SCENERY COUNTERWEIGHT SYSTEMS CYCLORAMA FITTINGS DRAW CURTAIN TRACKS DRAW CURTAIN OPERATORS GRAND PIANO TRUCKS KEYSTONES AND CORNERS LOCKING RAILS PIN RAILS PIPE BATTENS RIGGING— ALL TYPES ROLLER CURTAINS ROPE AND CABLE STAGE BRACES STAGE SCREWS STEEL CURTAINS TRIM CHAINS WINCHES 223-233 West Erie Street CHICAGO Standing Room Only? NO! Working room! On a roomy, guarded platform big enough to hold the worker's tools. And Dayton Safety Ladders have many other superiori ties, too. Wide leg-spread, which insures stable, non-slip stand on any floor surface. Easy-to-carry lightness, and fold-flat compactness. Steel-braced strength throughout. Made in sizes 3 to 16 feet. Moderately priced. Full hijormatioii from Dept. BT-4 THE DAYTON SAFETY LADDER CO. 121-123 West Third St. Cincinnati, O. Safety Ladder (Patented) Stock carried on Pacific Coast by E. D. Butlard Co., Los Angeles and San Francisco, and by 160 other distributors from coast to coast. Made and distributed in Canada by Percy Hermant, Lfd., Toronto. ing else that could serve its purpose. But today the high intensity lamp has been perfected in such measure that it is no longer troublesome or intricate from an operating standpoint, and gives satisfactory results. Aslicraft Automatic Arc Company, 4214 Santa Monica Boulevard, Los Angeles, Cal. BRENKERT LIGHT PROJECTION COMPANY, 7348 St. Aubin Avenue, Detroit, Mich. HALL & CONNOLLY, INC., 24 Van Dam Street, New York City. A Lamps, Incandescent, Projection THIS TERM may be confusing as there are lamps for motion picture projection as well as lamps for spotlight, searchlight, floodlight, and stereopticon projection. Some are quite different, and each should be used in the service it is designed for. There are two lamps made especially for theatre projection with professional apparatus. The 900 watt, 30 ampere, 30 volt lamp and the 600 watt, 20 ampere, 30 volt lamp. They cannot be used on the ordinary lighting circuit without a regulator or transformer to change the current to the correct amperage and voltage. For portable projectors such as are generally classed as "amateur" there are several types of projection lamps in very wide use. There are the 50, 100 and 200 watt lamps for use on 115 volt circuits and thr 200 and 250 watt, 50 volt lamps which are operated with a regulator. All of these lamps are designed to project the most possible light on the screen. The 900 watt lamp produces enough light to work efficiently on throws up to 100 feet. The 600 watt lamp is used for throws shorter than 80 feet. The other lamps are for short throw work, generally with 16-mm. film. Other lamps designed for spotlight service can be had in wattages of from lUO watts to 10,000 watts for use on 115 volt lines. The 100 and 200 watt sizes are all standard and are carried in stock. There is a standard lamp of 1,000 watts for use on 115 volt lines for motion picture projection. It is not, however, as efficient as the 30 volt type for motion picture work imd is generally used for non-theatrical service. Edison Lamp Works, General Electric Company, Harrison, N. J. National Lamp Works,^ Nela Park, Cleveland, O. Westinghouse Lamp Company, 150 Broadway, New York City. A Lamps, Mazda THE USE of the Mazda lamp has broadened in recent years, and today these lamps are used in projectors in the theatres and on stages of the studios. It has been said, and perhaps rightly, that light sells the show. Especially is this true in the cities where scores of theatres are vying with each other for patronage. In the display signs, in the strip signs, in the marquise, in the lobby and in the theatre proper, the Mazda lamp has made the White Way, whether in the metropolitan centers or in the small towns, whiter. It is being used in the studio as well as theatre. Durable colored lamps may now be purchased with coloring on the inside, permitting the lamps to be washed. Edison Lamp Works, General Electric Company, Harrison, N. T. GENERAL ELECTRIC COMPANY, 1 River Road. Schenectiidy, N. Y. National Lamp Works, Nela Park, Cleveland, O. Westinghouse Lamp Company, 150 Broadway, Nevi York City. Lamps, Reflector Arc A CARBON arc lamp for motion picture projection using a reflector for projecting the light through the aperture of the picture machine. The complete lamp contains as a part of the unit an automatic arc control adjusted to operate at a variance of a fraction of a volt at the arc. The advantage of the reflecting arc lamp is that it will operate at from 20 to 25 per cent of the electrical current necessary to operate the old style arc lamp. The carbons used are much smaller in size, making an additional saving. The reflector arc is now accepted as a necessity by progressive exhibitors, because, in addition to saving electric current, it produces a flat even field of bright crisp white light which is very desirable in motion picture projection. Prices range from around $125 to $550. BRENKERT LIGHT PROJECTION COMPANY, 7348 St. Aubin Avenue, Detroit, Mich. HALL & CONNOLLY, INC., 24 Van Dam Street, New York City. J. H. Hallberg. 29 W. 57th Street, New York City. KLIEGL BROTHERS, 321 W. SOth Street, New York City. THE J. E. McAULEY MANUFACTURING COMPANY, 5S4 W. Adams Street, Chicago, 111. Morelite Company, Inc., 600 W". S7th Street, New York City. W. G. Preddey, 187 Golden Gate Avenue, San Francisco, Cal. STRONG ELECTRIC CORPORATION, 2501 LaGrange Street, Toledo, O. A Lantern Slides Refer to SLIDES A Lenses FOR MOTION PICTURE theatre service there are projection lenses and condensing lenses. The latter are also used in projection but are placed in the lamphouse and condense the rays to a spot on the aperture. Projection lenses are objective lenses placed in the projector head. The prime requirement of a projection lens is to give a bright, well defined picture on the screen without any distortion or color rays. These lenses are made in four sizes: Eighth, quarter, half and three quarters (diameters, respectively, of 1 11/16, 1 5/16, 2 25/32 and 3K inches). The one-eighth and one-quarter sizes arc furnished in equivalent focii of two inches E. F., to eight inches E. F. The half-size is furnished in equivalent focii of four and a half inches E. F. to ten inches E. F., and the three-quarters in equivalent focii of from six inches E. F. to ten inches E. F. There is also procurable a bifocal projection lens with a range of from one-half to threequarters of an inch in focal length, designed to eliminate the change of lenses in shifting operation from sound to silent films, and vice versa. All the sizes named are standard. Focal lengths are determined by the length size of the picture desired. Prices range from $10 to $150. BAUSCH & LOME OPTICAL COMPANY, Rochester, N. Y. G. P. Gocrz American Optical Company. 317 E. 34th Street. New York Citv. ILEX OPTICAL MFG. COMPANY, 726 Portland Avenue, Rochester, N. Y.