Electric lighthouse lamps,  1949.
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 Kein Model Release vorhanden
Property Release Nicht spezifiziert

Land United Kingdom
Bildanbieter © Science & Society / FOTOFINDER.COM - Veroeffentlichung nur gegen Honorar, Urhebervermerk und Belegexemplar an FOTOFINDER.COM @ Ali Paczensky e.K., Buelowstr. 27, 10783 Berlin. Hinweis: NO MODEL-RELEASE! Bei werblicher Nutzung vorher Kontakt aufnehmen via E-Mail: info@fotofinder.com, Telefon: +49 (0)30 9150 0486. Ueberweisung des Honorars erfolgt an: FOTOFINDER.COM e.K., Deutsche Bank IBAN: DE64 1007 0024 0461 7700 00, BIC: DEUTDEDBBER.
Fotofinder.com Bildnummer 6968154 / 7BFD52ADC9AF5D9F