Two cathode ray tubes, in which there are three platinum wires fused into small glass heads. These three wires supply positive electricity while a fourth, negative, wire carries a cathode in the form of a concave mirror (a). | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / SCIENCE SOURCE / New York Public Library |
Bildgröße: | 3000 px × 2971 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |