International projectionist (Jan-Dec 1957)

ELECL CHANGEOVERS (Continued from page 16) right — from each projecting position) . (2) Single finger push to each projector. (3) Single foot push to each projector. All these controls are regular industrial ironclad pushes. The effective wiring diagram is shown in Fig. 11, and it will be seen FIG. 10. Diagram of the Zippa unit. that the whole system is based on simplicity. Table 1 shows all the details of plunger movement, cable lengths, etc. (See also Fig. 10). After making up quite a number of changeover units in 2-inch conduit, it was decided to employ standard steel boxes 6 inches x 3 inches x 2 F&B FILM REPAIR AND SPLICING BLOCK REPAIRS DAMAGED FILMS 19.95 Used with NEW MAGIC MYLAR Sprocketed Transparent Splicing Tape Magic Mylar Sprocketed Transparent Splicing Tape repairs torn, gouged films as good as new . . . without the loss of a single frame. Applied directly on both sides of the damaged film, Magic Mylar (only 1/1000 of an inch thick) repairs, reinforces and holds the broken film together . . . WITH THE STRENGTH OF MORE THAN 3 TIMES THE ORIGINAL FILM. REPAIR TEARS REPLACE BROKEN SPROCKET HOLES REPLACE GOUGES STRENGTHEN LAP SPLICES MAKE BUTT SPLICES MAGIC "MYLAR" TRANSPARENT SPROCKETED SPLICING TAPE 16mm— Single or double perf. 66 foot roll $ 5.00 35mm-66 foot roll 9.00 FLORMAN & BABB, INC. 68 W. 45th St., N. Y. • MU 2-2928 F&B carries a complete stock of motion picture and audio-visual equipment. inches instead. This economizes in labor charges and is easier to assemble and fit. The unit boxes are jigdrilled standard, except for the vertically mounted units which have the %-inch hole at one end of the box. At the other side of the case a %-inch hole receives the brass tube into which the end nosing fits. Two bolts hold the whole assembly quite rigid. The TABLE 1. Projector Piston Travel Bowden Cable Length Limit Stops Mounting Westar 1%" 6y2" y4" Hor. Simplex 1 and 7/16" Bell crank. 13/32" Hor. Kalee 8. 1 and 3/16" 24" 17/32" Vert. Kalee 11. 1 and 3/16" 24" 17/32" Vert. Kalee 12. 1" 24" %" Vert. Ross both types 1 and 5/16" 8%" 15/32" 30 deg. Greenfield flexible tube entry at the bottom of the box near and parallel to the handle shaft. The Bowden casing is in each clamped within a mild steel FIG. 11. Connections to 12-way terminal strips. nose by means of an Allen recessed screw. The brass tube carrying the solenoids has a small steel collar with reduced endpiece which fits into a two pairs of wires from the solenoids are taken to a four-way terminal strip and soldered. The strip is paxolin, and it is bolted to the box, using %-inch tube spacers. The outgoing polyvinylchloride four-core cable is soldered to this strip, and is 4 feet, 9 inches long. In several instances some pickup from the pushes has occurred on the sound system; a certain cure for this trouble has been the inclusion of one 0.1 mfd capacitor across each push. It is not claimed that these units are ideal from a technical and mechanical viewpoint. Indeed, they could possibly be made more efficient from such observation, and with more elaborate tooling; but as far as actual operation goes, these changeovers are imperceptible — which surely is the criterion. All-Europe Tech Conference The fourth congress of the European Union of Film and TV Technicians, recently meeting in Versailles, France, has asked for an All-European film conference on a technical level to integrate European film industries. Problems of both motion pictures and TV would be considered, and the conference would be attended by major delegates from both mediums, from producers on down. •••••' Consistent Maximum Light of Greater Economy DIAMOND ma PROJECTION ^m 70 PINE STREET • NEW YORK 5, N.Y 34 INTERNATIONAL PROJECTIONIST DECEMBER 1957