A great searchlight of 316 million candlepower, fitted with iris shutter. Diameter 6 feet 6 inches. Lighthouse at Heligoland, made by Siemens Schuckertwerke of Nuremberg, Germany.



Source: Steve Kirch, collector, and creator of a great website about SCIENTIFIC AMERICAN in the past

Restoration by: magscanner

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Created on

Thursday 17 June 2010

Posted on

Thursday 17 June 2010

Tags

beam, danger, illumination, vision, warning

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• General Magazines / Science and Technology Magazines / Scientific American

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