The Exhibitor (Aug-Nov 1948)

burning. This feature, found only in the latest models, is claimed to be an absolute requirement in modern lamps. More Features Internal features and characteristics claimed for the improved lamp include: positive carbon holder designed to con¬ tain either seven or eight millimeter car¬ bons; negative carbon holder designed to accommodate either six or seven milli¬ meter carbons (the jaws won’t break car¬ bons during trim); positive and negative carbon support near arc; precise carbon positioning — with both vertical and hori¬ zontal negative alignment; dual 'carbon feeding — with both negative and positive carbons being fed independently by sepa¬ rate feed screws; full ten-inch travel on positive carbons; reflector held in castaluminum frame and adjustable on its optical axis; non -wearing, oilless shafts — with full ball-roller and self-oiling bear¬ ings throughout; uncluttered lamphouse — ■ no rods, pans, wires, etc. External features and characteristics claimed, include: ammeter, rheostat, and arc-imager seen through arc-vision win¬ dows; mirror-flame shield and light cut¬ off dowser operated by dowser handles on both sides of lamp; manual controls for arc positioning placed outside lamphouse on operating side; accessible terminal plate is fully ventilated through double, in¬ sulated doors; lamp is finished in graywrinkle with anodized aluminum trim. Lightmaster Rectifiers For converting alternating current to direct current in the operation of highintensity arc lamps, Ballantyne has a com¬ plete line of rectifiers that cover the entire range from forty to eighty amperes. These are enclosed in sixteen-gauge steel cases, which are finished in gray, baked-on wrinkle paint. Included in the line are the four-tube, forty-ampere type designed for one kilo¬ watt lamps; the four-tube, sixty-ampere single phase and four-tube, sixty ampere three phase types for forty-five to sixty ampere lights; and the six-tube, eightyampere single phase and six-tube, eightyampere three phase types for forty-five to eighty -ampere lamps. Compact and streamlined, the rectifiers require little floor space and may either be placed directly under the lamp being served or in a remote corner. The housing is ventilated by natural draft that escapes through slotted sides and through the top. To furnish ready access to tubes, the top is hinged. In all rectifier types provision is made for wide-range voltage adjustment. Con¬ nector strips and conduit wiring holes are standard. Also, Ballantyne rectifiers are available in fifty and sixty-cycle types, “at the same basic low cost.” * Projector — A Highlight You will want to be sure to appraise the Royal Soundmaster, RSM Model R, pro¬ jector, formerly the Gardiner projector — if one is on display at the show. It has not yet been put on the market. Ballantyne recently bought the machine — its first pro¬ jector — from L. J. Gardiner, of Colum¬ bus, Ohio. The old projector, Ballantyne says, “is being completely modernized, both in¬ ternally and externally.” The most dis¬ tinctive feature of the machine — the barrel-type rear shutter, the only one driven directly from the intermittent fly¬ wheel shaft — is being retained, however. “This unique method of construction eliminates the possibility of backlash de¬ veloping between the intermittent and the shutter,” according to the new makers. “The perfect dissolving effect of the barrel-type rear shutter, on the light beam, is accomplished without the complicated synchronizing apparatus necessary where the conventional disc-type of double front and rear shutter is used The Model R rear shutter is equipped with flanges that pro¬ vide air cooling of utmost efficiency.” First Ballantyne Projector Other features to be retained are the removable film gate for inspection and cleaning, said to be easily handled; the rigid gate mounting, recently improved; framing knob on both working and non¬ working sides of projector; double-bearing intermittent, and cast iron main frame. All gears are alternate steel and fibre, to insure “a lifetime of quiet service.” Among the changes now being incor¬ porated are a complete new external de¬ sign, overall enlarging of projector to pro¬ vide more internal working room, shock proof spiral gears, micrometer lens focus¬ ing, full -width doors to furnish more working space, and heavy non-warping aluminum doors and housing. Base Ready Already on the market is a new base, a complement to the Model Eight soundhead and the forthcoming Model R pro¬ jector. The base, decorated in chrome, slants forward. It is called the Model 1800. In Here ’s Your Bigi DOUBLE FEATURE in Saieiy Theatre men everywhere rely on Dayton Safety Lad¬ ders for maximum safety and convenience. Ideal for your marquees — perfect for those odd jobs. Daytons are constructed of tested airplane spruce and reinforced with rigid steel supports to give great strength and lightness of weight. Sizes 3 feet to 16 feet in height with Standard Rubber Safety Shoes at no extra cost. Write today for Bulletin No. 7E DAYTON SAFETY LADDERS QUEEN FIRE EXTINGUISHER. SAFETY SUPPLIES 2337 GILBERT AVE., CINCINNATI 6, OHIO In Canada— Safety Supply Company— Toronto September 22, 1948 PHYSICAL THEATRE DEPARTMENT of THE EXHIBITOR PT-19