The Exhibitor (May-Aug 1948)

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New Electronic Lamp Proved Practical Actual Theatre Use Shows Steady Light And Large Carbon And Power Savings By J. K. Elderkin, President, Forest Manufacturing Corporation The New Forest Electronic Projection Lamp, now fully tried and proven in the projection booth, has shown that first claims were extremely conservative. Due to the accurate and constant feed of the carbons, accomplished by the elec¬ tronic mechanism and control developed by Forest engineers, the arc gap is main¬ tained continuously at exactly the correct aperture, where the arc burns most efficiently and with greatest light output, resulting in a marked saving in carbon consumption. The savings in carbon amounts to from 20 to 25 per cent along with proportional savings in electric current. The above feature alone makes this lamp the most efficient light source for projection yet produced, and results in a marked savings of operating costs over any other present projection lamp. This new lamp also offers many other advantages not to be found elsewhere. For instance, a great deal of research was made on the burning characteristics of the car¬ bons with respect to the magnetic field and amount of air required at the arc. This research resulted in the placing of special air inlet ports in a position where the arc receives the proper amount of air to supply the arc requirement, and a mag¬ netic field was developed whereby the bright spot area is maintained at maximum brilliancy. Carbon Holders Full floating positive and negative car¬ bon holders maintain the carbons in per¬ fect alignment at all times, and controlled spring tension clamping prevents cracking of carbons by applying too much tension. (See photos 2 and 3.) Mechanism The positive mechanism and the nega¬ tive mechanism are two distinct and separate units with no mechanical con¬ nections one to the other, and each can be removed from the lamp as a unit very easily. (Above) View through door showing full floating self aligning positive carbon holder with spring clamping device. Positive carbon guide, flame shield raised and reflector holder. Photo 3 (Below) View through door looking toward back of lamp showing the full floating self aligning nega¬ tive carbon holder with its spring clamping de¬ vice which results in prevention of breakage. (Above) View through back door of lamp show¬ ing the two electronic timers with their connec¬ tion plugs cover removed. Knobs for adjustment of reflector and vertical adjustment of guide. Photo 5 (Below) Side view showing positive and negative manual feed controls at bottom. Seen are positive and negative electronic timer control knobs center and reflector adjustment knobs top front. Close up view through back door shows negative solenoid actuating mechanism wi'h cover removed. Pawl moves ratchet gear around a pre-determined distance each time the solenoid core is drawn upward. The number of degrees of rotation of ratchet gear can be adjusted by means of the slotted adjuster. This ratchet gear is on the end of the worm gear which moves the carbon holder forward. There are no clutches or intermediate gears; this is the entire actuating mechanism of the negative carbon feed. PT-12 PHYSICAL THEATRE DEPARTMENT of THE EXHIBITOR June 2, 1948