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Vol. IX No. I March, 1932
A MINING FILM
BY ERNO AIETZNER.
The plot of Kanieradschaft, a Nero-film directed by G. W. Pabst, concerns a serious accident in a coal-mine, and naturally a considerable part of the film is played underground. In the following article, the architect, E. Metzner, who designed and built the sets, tells of the extraordinary problems that had to be solved here. Opposite is an original sketch by Erno Metzner for the mine wrecked by explosion. — The Editor.
Having thoroughly studied mines of the Ruhr-district and the coaldistricts in the North of France, the director has decided to have the subterranean scenes necessary to the film, erected in the studio. First necessity : Picture and sound must be absolutely true to nature.
Empty or laden lorries are to roll in the studio, booming, rumbling along the tubes — yet the sound must not be reflected. The creaking of the wheels on the rails has to be choked. There is no echo in a mine. Light and sound stay close to their source in the silent darkness. The noise of rolling coal-piles, shaking troughs and blasting shots, dies away without echo.
But the studio has wood-flooring. The buildings are partlv constructed on high wood-scaffolds, strongly resounding. They shiver and roar under the charge of the lorries, which with a weight of four hundredweight each, are joined to trains and dragged by an engine weighing nine tons; they hold the sound for a long time : and the events themselves are noisy. Tons of stones, when the drifts fall in, have to produce in the studio the force of the catastrophy of nature.
How to suppress the undesired resonance becomes the most urgent problem. The effect wanted is obtained by placing old rubber tires, cut up, under the sleepers of the rails, thus making them soundproof for a length of 300 yards. The essential quietness of all the rolling, falling and stampmg is perfected to a high degree by covering the whole floor of the tunnels with wet packed mud. The sound, of course, is hollow in the low, long construction, (shut on the top), and made of plaster of Paris, mostly, as in the original mine, strengthened by round timbers, corresponding to those in actual use. The impression of reality and genuineness of the d6cor and its occupants is augmented by heaping up buckets of coal-dust,
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