Manufacturing electric light bulbs, c1883 (1896). A mercury vacuum pump being used to evacuate (exhaust) light bulbs on a commercial scale. The pump being used is Geissler's as modified by Topler and was the type used by the Swan Company. From Electricity in the Service of Man by R Wormell. (London, 1896). | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Heritage Images / Oxford Science Archive |
Bildgröße: | 2994 px × 3491 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |