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Electric lighthouse lamps, 1949.
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Titel Electric lighthouse lamps, 1949.
Caption 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., 6968154
Aufnahmedatum 01.01.2009
Bildnachweis Science & Society / FOTOFINDER.COM
Bildname 10276253
Bildgröße 3504px x 2581px, 29,70 cm x 21,90 cm (300 dpi)
Model Release No Model Release available
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Land United Kingdom
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Fotofinder.com Bildnummer 6968154 / 7BFD52ADC9AF5D9F
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