Motion Picture Herald (Mar-Apr 1945)

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mances, a disappearing microphone is usually installed at the front of the stage. The connections to this special microphone are about the same as for the lapel mike with the exception that it requires a pipe-sleeve through :he floor to work in, and has a counter-balance framework controlled and operated by a run ?f manila rope lines and pulleys to the stage, with a sand bag attached to the ends. In the manager's office a receptacle polarized and ion-interchangeable, with matched impedance, should be installed. From this receptacle, a special microphone cable should be run in ?ither a ^2-inch or j^-inch conduit over to :he amplifier on the stage. For plugging into :his particular receptacle, either a cardioid or i crystal mike should be purchased and always cept ready in the manager's office. In determining the location of the public iddress speakers, it is very important that ill aspects of the theatre auditorium be carefully taken into consideration before arriving it a final installation. The judgment of a -ound engineer is needed for this, one who (Continued on following page) that when tubes in the amplifier are used on supply line voltages above the required value, their useful life is shortened without increasing their output efficiency? This also holds true when the supply line voltage is below the required value. that when abnormal values are found, either the 110-120volt switch should be adjusted to the proper input voltage required by the amplifier, or the tap on the primary side of the power transformer should be adjusted? that mercury vapor tubes must be preheated for a period of from 4 to 14 minutes, especially when new, to force all the mercury off the tube elements? Mercury vapor tubes usually require only 2 to 4 minutes of daily preheating after the initial preheating. that tubes having spiral extension springs to compensate for expansion or elongation of the filament when heated should also be sufficiently preheated to allow the filament to become normally stabilized before the plate or anode voltage is applied? that rectifier tubes also require this same preheating time for electron emission stabilization, otherwise the filament may be damaged or parts of it entirely burned away? that all tubes should always be handled or stored carefully to avoid sudden jars to the filaments? that the various types of tubes when stored away should be segregated in their respective places — that is, weak and good, new and old, or preheated and not preheated? SouStER UCENSED UNDER US PATENTS OF WESTERN ELECTRIC CO. INCORPORATED SOUND HEADS AMPLIFIERS TWO WAY HORN SYSTEMS COMPLETE SOUND SYSTEMS THE GYRO-FILTER PROVISION FOfl TRANSFORMER COUPLING^ LOCKING MICROMETEfl IN5TANT1 LATERAL GUIDE ADJUSTMENT J"\ CONHANT MIS OPTICAL SYSTEM CARRIAGE i ROTARY SCANNING DRUM-GYflOSCDPICALLY CONTROLLEO NEUTRALIZED POY/ER-PUISE PROJECTOR DRIVE .THROUGH ALTERNATE FIBER AND STEEL GEARS DIRECT CONNECTED MOTOR DRIVE NO-SHOCK STARTING PRE-F0CU5F.0 EXCITER LAMP , ISO-STABILIZER EXCITER "I _J LAMP MOUNTING FULLY PERFECTED! OPTICAL SYSTEM _J ALL FILM TRAVEL DM ROTATING 5URFAGE5 DESIGN AND RE5P0N5E [/OVER -SIZED ICU5HI0N MOUNTED MOTOR -ISOLATED SOUND FEED SPROCKET -TAKE-UP 5PRDCKET -FILM 5TRIPPER5 ^•□IL PROOF PHOTO ELECTRIC CELL HOUSING GOVERNED BY ACADEMY RECOMMENDATIONS DESIGNED TO LEADBUILT TO LASTENGINEERED TO DELIVER HIGH QUALITY BRILLIANT TRUE LIFE-LIKE REPRODUCTION LIGHT MASTER ONE KILOWATT PROJECTION ARC LAMPS SOUND MASTER PROJECTOR BASES THE BALLANTYNE CO. 1707-11 DAVENPORT STREET OMAHA 2 NEBR. U.S.A. LIGHTING CONTROL Our engineering staff will gladly assist in designing your dimmer control for intensity and color effects. WARD LEONARD RELAYS* RESISTORS* RHEOSTATS electric control (wl) devices since 7892. WARD LEONARD ELECTRIC CO., 91 SOUTH STREET, MOUNT VERNON, N. Y. •IMMEDIATE ® DELIVERIES On CHICAGO'S Supreme Expansion Bolts. Keep seats anchored securely. Available now at leading supply houses. CHICAGO Expansion Bolt Co. 2230 W. Ogden Ave., Chicago 12, III. The Show Must Go On... AND DOES with a Robin-Imperial STEDYPOWER J. E. ROBIN, INC. • 330 W. 42nd St. • New York City BETTER THEATRES, APRIL 28, 1945 33