International projectionist (Jan 1943-Dec 1944)

AT YOUR SERVICE (Continued from page 21) file cut the required new teeth. Only a rough approximation of the original tooth profile is necessary, the brazing metal being sufficiently soft to wear rapidly to the proper contour. This operation is not nearly as difficult as it sounds — a P-464380 Pinion with two broken teeth has been repaired by this method in approximately one-half hour. The second method, applicable to any gear but particularly adaptable to fiber or composition gears, is to drill and tap one or more holes, depending on the width of gear face, centered in the root of the broken tooth, seat firmly the screw or screws whose diameter should approximate the thickness of the gear tooth, and then file the screw to the approximate gear tooth contour. — E. G. Hemenway, ALTEC. Improved Position for ERPI Spare Parts Cabinet By mounting the ERPI spare parts cabinet upside down, a lip is provided on the upper side of each shelf preventing round objects from rolling off. More usable space is provided and the recessed top is an advantage. — J. A. Day, ALTEC. Lateral Weave in Simplex Soundheads Corrected I have had several cases of lateral weave in Simplex soundheads recently which have been traced to end play in the stabilizer shaft caused by loss of tension in the spring washers between the stabilizer wheel and the bearing. Two of these washers are provided with the equipment. If the end play is excessive, the convex sides of the washers should be placed together to increase the tension.— A. H. Clow, RCA. Installing Improved Changeover Switch on Old Systems In older installations where telephone type switches are used for sound transfer frequent trouble indicates that replacement is necessary. In such cases I order the Yaxley type stock No. 26290 switch and install it with a fader rod. This switch is cheaper and easier to service and allows greater operating convenience. In all cases the projectionist prefers the extension rod to the older method of pulling a string. — Frank Adams, RCA. Improved Operation of Western Electric 12A-12B Rectifiers The waiting time while a 314-A Western Electric vacuum tube or an 83 is warming up in the Western Electric 12A or 12B rectifier is important when the theatre is full of customers. This may be avoided and better results and longer tube life may be obtained by a fairly simple modification. I am not giving dimensions or actual procedure at this time; these can be worked out at the installation. IransVerteK Important facts about the leading motor generator in the motion picture field. The Transverter, manufactured exclusively by this company, meets every need of the projection room, from the largest high-intensity arc . . . down to the "one-kilowatt" arc. It is outstanding in reliability . . . constancy of output ... overload capacity . . . maintenance of high efficiency . . . with long, satisfactory performance. Its ability to give many years of quiet, dependable and economical operation is known throughout the entire motion picture industry. Consult : NATIONAL ' 'DivT.iwr ol NuiIaooI. Simple*-. SludwoiOi.tnt. In Canada, General Theatre Supply Co. THE HERTNER ELECTRIC COMPANY 12692 ELMWOOD AVENUE CLEVELAND, OHIO 11, U. S. A. Exclusive Manufacturer of the Transverter TOMORROW'S PERFECT PROJECTION Todcu/f ORTHOSCOPE LENSES These New Lenses Will . . . 1. Definitely improve distribution of light on the screen ... No more dark edges 2. Eliminate the "hot spot" 3. Amazingly improve color projection 4. Do away with side and front seat distortion 5. Perfect background focus on longshot scenes S. Give greater picture "depth" 7. Do away with "rainbow" effects 8. Cause film to run cooler ... no buckling ASK YOUR NATIONAL REPRESENTATIVE FOR DETAILS Distributed Exclusively by NATIONAL THEATRE SUPPLY Di v ilion of National « SimpUl • 81 ud wort+i, I n< . There is room on the end of the chassis is then bolted to the chassis over the hole, of the rectifier to mount two tube sockets There is also room under the chassis to by cutting out a rectangular hole and mount a separate heater transformer, mounting the sockets on a template which This can be placed in any convenient OCTOBER 1944 27