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

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