The Film Daily (1931)

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If Announcing Pre-Cratered 9 mm x 20 High Intensity Projector Carbons A / VNOTHER achievement of National Carbon research. The history of National Projector Carbons is one of constant improvement. But the merit of each new idea is definitely proved, by exacting laboratory and service tests, before it is applied to the product. The latest improvement is the pre-cratering of 9 mm x 20" National High Intensity Projector Carbons. Exhaustive tests, both in the laboratory and in actual theatre projection, have shown that pre-cratering achieves two highly important results. It enables the arc to "burn in" much more quickly and smoothly. It results in clean burning when the arc is struck on a new carbon. The Projectionist will recognize the value of these features. All 9 mm x 20" High Intensity Carbons now leaving our factory are pre-cratered. Also, the holder end of each carbon is beveled for easy insertion in the holder jaws. There is no extra charge. CTOR CARBONS Sold exclusively through distributors and dealers. National Carbon Company will gladly cooperate with the producer, exhibitor, machine manufacturer or projectionist on any problem involving light. NATIONAL CARBON COMPANY, INC. Carbon Sales Division ยป Cleveland, Ohio Unit of Union Carbide | I | M M and Carbon Corporation Branch Sales Offices: New York Pittsburgh Chicago San Francisco NATIONAL R O J E