Electric lighthouse lamps, 1949.

UNITED KINGDOM - AUGUST 23: On the left is shown a 10,000 watt lamp, whose filament differs greatly in shape from the oil or gas flames utilised in earlier lighthouse lamps. The expensive optics used in a lighthouse would have required significant redesign if a conversion to such an electric bulb was to be made. The 5,000 watt lamp on the right, however, which includes a Stanocil diffusing cylinder, overcame these disadvantages by surrounding the filament with a translucent cylinder of silica. A domestic 60 watt lamp is shown for comparison. (Photo by SSPL/Getty Images)
UNITED KINGDOM - AUGUST 23: On the left is shown a 10,000 watt lamp, whose filament differs greatly in shape from the oil or gas flames utilised in earlier lighthouse lamps. The expensive optics used in a lighthouse would have required significant redesign if a conversion to such an electric bulb was to be made. The 5,000 watt lamp on the right, however, which includes a Stanocil diffusing cylinder, overcame these disadvantages by surrounding the filament with a translucent cylinder of silica. A domestic 60 watt lamp is shown for comparison. (Photo by SSPL/Getty Images)
Electric lighthouse lamps, 1949.
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Credit:
Science & Society Picture Library / Contributor
Editorial #:
90740768
Collection:
SSPL
Date created:
23 August, 1995
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Licence type:
Rights-managed
Release info:
Not released. More information
Source:
SSPL
Object name:
10276253
Max file size:
3504 x 2581 px (29.67 x 21.85 cm) - 300 dpi - 2 MB