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1947-48 Theatre Catalog, 6th Edition, Page 352 (338)

1947-48 Theatre Catalog, 6th Edition
1947-48 Theatre Catalog
1947-48 Theatre Catalog, 6th Edition, Page 352
Page 352

1947-48 Theatre Catalog, 6th Edition, Page 352

The New Ashcrait C-70 Projection Arc Lamp

New Maior Features Are Said to Constitute

New Advance in Design of Carbon Arc Lamps

Three years in the planning and actual design stage, and marking thirty years experience in the building of carbon-arc lamps, the new Ashcraft Suprex C-70 projection lamp embodies several major features and numerous others which constitute a radical departure from conventional design and signalize a distinct advance in the art.

Among the features of the new C-7O lamp are the following:

Wide range-40 to 65 amperes current capacity.

Unit constructionea compact, removable mechanical element which simplifies operation and servicing and assures long life.

Exterior controls-all mechanical and manual controls are outside the lamphouse itself.

EXTERIOR VIEW of the Ashcrait C-70 lamp shows the grouping ot all mechanical and control parts in a single element wholly outside the lamphouse. The advantages ot a solid cast aluminum housing, including doors, over the conventional sheet metal type are obvious in terms oi

Dual feeding meanseboth positive and negative carbons are fed independently by separate feed screws.

Optical excellence-so designed for a 14-inch mirror as to match perfectly an f/2.0 coated lens.

Modern housingesolid cast aluminum instead of the conventional sheet metal.

Novel control paneleall manual controls and an ammeter on a compact panel of high visibility at the rear operating side of the lamp.

Unique arc stabilizer-a simple yet positive-acting steel loop replaces the cumbersome behind-the-reflector magnet.

Arc imagerevisible from any viewing angle.

Precise carbon positioningeboth vertical and horizontal negative alignment means provided.

Non-slip duplex clutch-eliminates pawls and ratchets, locking positively after each feeding cycle.

Non-wearing, oilless shaftsefull ballroller, and self-oiling bearings throughout.

Uncluttered lamphouse-no rods, pans, wires, and so forth.

The constantly increasing number of color films poses a very serious problem in screen illumination for eventhe smallest theatres. The so-called l-kilowatt lamp is rapidly becoming obsolescent for just this reason: it has a very limited range (40-42 amperes); an inefficient optical system (not adaptable for the fast f/2.0 lens), and a single non-variable-ratio feed screw which defies even constant manual adjustment by the projectionist.

lighter weight. greater resistance to dentinq and rusting, and general superior durability. The C-7O is designed tor satisfactory operation without forced ventilation or any other extraordinary precaution. Opening: are provided for natural dralt without interfering with the arc's stability.

1947-48 Theatre Catalog, 6th Edition, Page 352