International projectionist (Jan 1963-June 1965)

lems peculiar ti> gaseous-discharge light sources. That the tenon arc is free from the energy-distribution limitationof the mercury are will soon he apparent. Vo mercury is used in the xenon lamp. Xenon Satisfactory for Projection Xenon is an invisible, heavy, odorless, non-poisonous, Don-combustible, and verj rare gas of the helium family of chemically inert elements (helium, neon, argon. krypton, xenon, radon); and it. too, emits light when excited In the passage of electricity. And as is the case with mercury vapor, the emission lines of xenon are broadened and improved for illuminating purposes by pressurizing the gas. However, there are very important differences between xenon light and mercury light — differences which serve to impress us with the very satisfactory visual qualiu of the light emitted In pressurized xenon gas when an electric current of the proper voltage characteristics is passed through it. Unlike mercurj light, which has onl\ three brighl •■mission lines, xenon lignl has a large number of lines evenhj distributed throughout the entire \ i-il >!«• spectrum. \nd when the xenon gas is placed under pie— me. the lines broaden and merge into one another to form a continuous spectrum containing all of the color associ ated with the different wavelengths of lighl from TOO millimicrons (deep red) to 400 millimicrons (intense violet). None are missing. The result is a daylightwhite light of continuous energy distribution which is visually pleasing and ui\e a complete!) natural rendition of the colors recorded on dye-image color films, Violet Blue Cya n Green YdlowOrui^* Red ,^ &* 'I _i -*»■ . ^ — — ■ ~^z£ ;"'-% _>UN . 2^ "*«"** ;r0\ 3 f L.I. ArtC s&P /"V 400 300 600 700 Nanometer* FIG. 3 Spectrophotometric curves in the visible spectrum of average noon sunlight, the high-intensity and Ion-intensity carbon arcs, ami the tungsten-filament (mazda) lamp. The weakness of mazda illumination in the shortit arc end of the spectrum ! violet to blue) results in a distinctly yellonisli li^ht. such color as Eastman Color, erraniacolor. etc. Technicolor. Gevacolor, \ufa Quality of "White": Color Temperature The ideal color-quality of illumination for motion ja&aa& PROVED BYTEST...BYFARTHE BEST Arc Lamps and Rectifiers for Every Projector... for Every Theatre... The World's Finest HERE ARE THE FACTS SUPER ClrMEX . . . The masterpiece of the most experienced projection lamp designer. No other lamp has even remotely approached its perfection from every point of view— mechanically, electrically, optically, hydraulically or its fine air-conditioned system. Its durability and stamina have been proved. More and more fine theatres and drive-ins are re-equipping with Ashcraft Super Cinex daily due to their fine reputation for perfect screen light and service. Current range with 1 3.6 mm carbon, 125-165 amperes. CORE-LITE ... the latest and most phenomenal producer of white light at lowest possible operating cost in the family of Great Ashcraft Arc tamps. Same arc burner and arc controls as the SUPERCINEX. Same quality and built-in reliability. The lamp is optically designed to give greater white light distribution at less cost for carbons and electricity. There is none better— anywhere! 70-110 amp. CINEX 35/70 SPECIAL ... The Great of the Ashcraft Arc tamps is a modified Super Cinex. Like the Super Cinex no third element or relay lens is necessary regardless whether 35 mm or 70 mm film is being projected. Uses a 13.6 mm high intensity positive carbon at current ranges between 1 25 and 1 40 amperes. RECTIFIER . . . THE SPECIAL CORELITE I 2 PHASE HIGH REACTANCE RECTIFIER . . . designed for the requirements of the Core-Lite lamp, this rectifier will give the best results. Low reactance 6 phase rectifiers should not be used. Certain motor generators, but not all, are acceptable. The special Core-Lite S/1212 rectifier will give you long, excellent service with an absolute minimum of expense. Other Ashcraft rectifiers available for every power need. The cost is no more than for inferior rectifiers. m^kmWkmWkmlkm^km^kmWkmWkmmm^m SOLD EVERYWHERE IN THE UNITED STATES BY LEADING RECOGNIZED THEATRE SUPPLY DEALERS I.S. ASHCRAFT MFG. CO., INC. • 36-32 38th STREET LONG ISLAND CITY 1, N.Y. International Projectionist June 1963 9