X-ray tubes
1910-1920
Coolidge tube, United States, 1920
1920
Copper target with tungsten core attached to glass cold cathode tube
1913-1920
Glass-stoppered bottle containing tungsten
1801-1892 (prepared)
100 candle power 'Pointolite' electric Lamp
1923
Rolls Royce 'Spirit of Innovation' electric aircraft
2021
