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PROJECTION LAMP
Listed with Underwriters Loborotories, Inc..
Ca nod Ion Stand Assn.
riie new Air-Master projection lamp is another step in the progressive policy of The Ballantvne Company of constantly bringing to the theatre mdnstry new and unproved sound and projection equipment.
Thi'; new 40 ho ampere high intensity arc lamp, tlirough actual tests, piojects at ihr srrrt fi a steady, hiilliant light of greater volume than any comparable lamp. A multi-purpose lamp, the Arc-Master provides 1 kvv. 45. 50. 55 and 60 ampere operation without any mechanical change in the negative and positive feeds — made possible through simplified controls that provide easy adjustment of positive and negative feed. No change is necessary in the negative and positive carbon jaws which are designed for bmrn or 7nim negative, and 7mni or 8mm positive carbons. The .■\iT-Master offers many other unique operating improvements designed to give you hc'lter light, simpler and more economical operation:
Fool-proof .carbon jaws permit burning of the maximum of carbons without use of corbon saver.
Jows cannot break carbons when making carbon trim.
Negative and positive carbons have heat resistant guides near burning end for perfect co-axial alignment.
Improved ventilating system.
Electro arc stabilizing magnet.
Vertical and horizontal adjustment on negotive carbons.
Bausch and tomb reflectors with maximum reflector-area.
Full 10 travel on positive carbons.
Inside dowser system with mirror flame shield for protecting mirror while striking arc.
Mirror held in cost aluminum frame and adjustable on its optical axis, lamp includes ammeter, trimming light, arc imager, removable ash troy, and arc vision windows.
Finished in groy wrinkle with chrome trim.
Priced competitively with 1 kw lamps; performs competitively with much higher priced lamps.
Another Manufacturer Describes His Latest Model
(Continued from preceding page)
aperture plate is of one-piece hardened and ground construction. There' are two sets of hardened and ground film shoes. The upper shoes effectively snub patches while the lower ones are long enough to hold the film flat during the period it is at rest in the aperture. Dual pad rollers are used on both upper and lower sprockets. A combination framing and pilot lamp iS provided.
“The drive side (Fig. 2) is of simple straightforward design, eliminating all
Fig. A
unnecessary gearing. The vertical shaft carries the ball-type governor which controls the fire shutter. The rear shutter is driven directly from the camshaft eliminating back lash and shutter oscillation.
"The intermediate and main-drive gears I Fig. 3) revolve on fixed hardened and ground pinions. By removing one screw
Fig. 1
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The MODERN THEATRE SECTION