International projectionist (Jan-Dec 1936)

30 INTERNATIONAL PROJECTIONIST September 1936 THE FOREST TWIN 50 COPPEROXIDE RECTIFIER For 2 Projection Arcs-- AND A SPOT! • LIST PRICE: $500 • FOREST TYPE TWIN 50 C-O RECTIFIER —employs the copper oxide units, insuring long life and quiet, trouble-free and efficient operation— all with a maintenance cost that is nil. How Many? Was this copy dog-eared when it came to you? How many men read it ahead of you? You would receive a clean, fresh copy if you had a personal subscription — and you wouldn't have to wait — you would be first to read it. Use coupon below. INTERNATIONAL PROJECTIONIST, 580 Fifth Ave., New York, N. Y. Enter my subscription for Name □ 1 year — 12 issues — $2.00 □ 2 years — 24 issues — $3.00 Foreign: Add. 50c per year. Address City ... Slate • FOREST Twin 50 is the ideal power supply for TWO Suprex arcs, of 30 to 50 amperes each. It will also supply a 30 to 60 ampere regular carbon arc Spot Lamp, 50 to 55 volts. • SEE your dealer today, or write to us for detailed information about this up-to-the-minute rectifier development for modern projection arcs. Circular Upon Request FOREST MFG. CORP. Rectifier Specialists Belleville New Jersey U. S. A. tion room, not only as a means of consolidating control of the entire sound system in one place but also to preclude the possibility of any arguments developing between themselves and stagehands as to jurisdictional rights. Filtered d. c. field excitation is provided from a separate power unit, operating from a 105-125 volt, 60-cycle supply. Modernization With Mirrorphonic Projectionists should be interested in the merchandising as well as the technical aspects of the Mirrorphonic system, so that they may be able to render competent advice to either owners or managers by presenting the whole story. Thus this appendage. The term "Mirrorphonic" denotes a complete sound-picture reproducing system; but modernization of existing equipments may be accomplished by the installation of individual Mirrorphonic units from time to time, depending upon the preference of the customer — or, stated bluntly, upon his ability to pay. Table A of the preceding article is a concise representation of the various Mirrorphonic installations. Any combination of equipment mentioned therein is a Mirrorphonic system; while the lack of any given unit means that Mirrorphonic results are not obtainable. Theatres that are still using the old 8-B and 10-A amplifiers, with contemporary speakers and other equipment, require a complete new Mirrorphonic installation (apart from the wiring run from amplifiers to speakers, of course) . The modernization job need not be done at one fell swoop; any Mirrorphonic unit — soundhead, amplifier, speaker, etc. — could be installed first. The soundhead is the natural choice for a starter, other units being added subsequently. Many theatres now have the Erpi Wide Range system, installations of which were made as recently as two months ago. Some of these houses have the new cellular speakers, or the new amplifiers, or some unit of the Mirrorphonic system. Reference to Table A, mentioned previously, will enable a quick decision as to what units are needed to bring a given system up to the Mirrorphonic standard. Here again the unit installation plan may be adopted. The importance of this presentation of Mirrorphonic data (particularly Table A) to the projectionist can not be overemphasized. As the only group in the theatre field that knows the complete story — technically and otherwise — projectionists are in a position to render a valuable service to their employers and thus add to their prestige. If they are not asked about this development, they should volunteer the information. I. P. has no more important function than to disseminate information of this character, which not only contributes substantially to improved reproduction in the theatre but also permits the craft to assume its rightful place in the development of the art.