10314059
Fleming's original thermionic valves, 1889.
10314059
Fleming's original thermionic valves, 1889.
10474672
Electrical interrupter, c.1900.
10474672
Electrical interrupter, c.1900.
10474673
Induction-compensator, c.1900.
10474673
Induction-compensator, c.1900.
10474674
Induction compensator, c.1900.
10474674
Induction compensator, c.1900.
10474675
Induction compensator, c.1900.
10474675
Induction compensator, c.1900.
10474676
Induction compensator, c.1900.
10474676
Induction compensator, c.1900.
10474679
Diagram for stroboscopic speed regulation, c.1885.
10474679
Diagram for stroboscopic speed regulation, c.1885.
10474680
Diagram for stroboscopic speed regulation, c.1885.
10474680
Diagram for stroboscopic speed regulation, c.1885.
10436436
‘Electrical Apparatus No 2’, 1804.
10436436
‘Electrical Apparatus No 2’, 1804.
10324891
Large plasma ball, c 1990s.
10324891
Large plasma ball, c 1990s.
10325971
Hauksbee's frictional electricity machine, 1706-1708.
10325971
Hauksbee's frictional electricity machine, 1706-1708.
10436435
‘Electrical Apparatus No 1’, 1804.
10436435
‘Electrical Apparatus No 1’, 1804.
10325782
Quartz crystal in valve. Quartz crystals ar
10325782
Quartz crystal in valve. Quartz crystals ar
10309217
Crookes tube, c 1888.
10309217
Crookes tube, c 1888.
10422595
‘Electricity’, 1850.
10422595
‘Electricity’, 1850.
10326343
Diode valve, early 20th century.
10326343
Diode valve, early 20th century.
10431938
Electrical experiment, 1933.
10431938
Electrical experiment, 1933.
10326050
Wheatstone's original dynamo, c 18th centur
10326050
Wheatstone's original dynamo, c 18th centur
10326049
Apparatus employed by Sir Charles Wheatston
10326049
Apparatus employed by Sir Charles Wheatston
10326014
Wheatstone's experimental magneto, c mid 18
10326014
Wheatstone's experimental magneto, c mid 18
10324627
Original Parsons three-phase turbo-alternat
10324627
Original Parsons three-phase turbo-alternat
10324628
Original Parsons three-phase turbo-alternat
10324628
Original Parsons three-phase turbo-alternat
10324629
Original Parsons three-phase turbo-alternat
10324629
Original Parsons three-phase turbo-alternat
10324630
Original Parsons three-phase turbo-alternat
10324630
Original Parsons three-phase turbo-alternat
10190599
Aurora tubes and flasks, c late 18th or early 19th century.
10190599
Aurora tubes and flasks, c late 18th or early 19th century.
10190585
Electric chimes, 1780s.
10190585
Electric chimes, 1780s.
10193134
Armstrong's hydro-electric machine, 1845.
10193134
Armstrong's hydro-electric machine, 1845.
10324719
Thomson's cathode ray tube, 1897.
10324719
Thomson's cathode ray tube, 1897.
10262650
Crookes Maltese cross tube (left) and radiometer (right), 1879-1888.
10262650
Crookes Maltese cross tube (left) and radiometer (right), 1879-1888.
10262212
Cylinder machine, 19th century.
10262212
Cylinder machine, 19th century.
10193043
Crookes' tube showing the phosphorescence of rubies, 1879-1888.
10193043
Crookes' tube showing the phosphorescence of rubies, 1879-1888.
10419162
Glowing Geissler tubes, 1858.
10419162
Glowing Geissler tubes, 1858.
10193032
Crookes' mill-wheel tube, 1879-1888.
10193032
Crookes' mill-wheel tube, 1879-1888.
10324054
Crookes radiometer, 1879-1888.
10324054
Crookes radiometer, 1879-1888.
10309218
Working Geissler tube, c 1988.
10309218
Working Geissler tube, c 1988.
10317635
Soft 'round' receiving valve, c 1916.
10317635
Soft 'round' receiving valve, c 1916.
10312437
Fleming diode, British, 1905.
10312437
Fleming diode, British, 1905.
10311227
Davy's potash experiment, c 1808.
10311227
Davy's potash experiment, c 1808.
10211951
A million volt impulse generator in action
10211951
A million volt impulse generator in action
10309220
Working Geissler tube, c 1988.
10309220
Working Geissler tube, c 1988.