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As we enter the shortest days of the year here’s the history of light bulbs
1850 — 1859: Lightning in a tube In the 19th century ... Peter Cooper Hewitt created a blue-green light by passing an electric current through mercury vapor. The lights had few suitable uses ...
PC Magazine5y
fluorescent bulb
A light source consisting of a long glass tube containing mercury in a partial vacuum. Available in many lengths and several diameters, the tube is lined with a fluorescent phosphor. When the ...