[August 25th, 1921] Peter Cooper Hewitt, inventor of the mercury-vapor lamp, dies in Paris. [b. 1861]
from /r/100yearsago
[1921年8月25日] 汞蒸气灯的发明者彼得-库珀-休伊特在巴黎去世。[b. 1861]
[1921年8月25日] 汞蒸气灯的发明者彼得-库珀-休伊特在巴黎去世。[b. 1861]
[August 25th, 1921] Peter Cooper Hewitt, inventor of the mercury-vapor lamp, dies in Paris. [b. 1861]
from /r/100yearsago