111a&b. 2 Blueprints of arch mechanism, by Frederick John Kiesler. Frame construction and machinery showing mechanism for reeling off all backdrops of the opera on a roll of canvas 120 feet long. The mechanism is so designed that it can be operated by

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{"value"=>"111a&b. 2 Blueprints of arch mechanism, by Frederick John Kiesler. Frame construction and machinery showing mechanism for reeling off all backdrops of the opera on a roll of canvas 120 feet long. The mechanism is so designed that it can be operated by one man. He is able to propel one scene after the other, or recall a previous scene. Stretching of the canvas after each change to take up possible sagging is provided. This is especially necessary when a cut-out appears in the canvas as in No. 101 or No. 108"}

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