Invisible
amber
Studied for years,
but named "electron", i.e. amber, only by J.J. Thompson
|
Invisible
amber
|
||||
Original
Crooks' tubes for studies of cathodic rays deviation
in a magnetic field [Science Museum, London] |
Original
Crooks' tubes for studies of cathodic rays [Science Museum, London] |
Original
vacuum diode of Flemming [Science Museum, London] |
