1879: Thomas Edison crowns 14 months of testing with an incandescent electric light bulb that lasts 13½ hours.
Sir Humphrey Davy had produced incandescent electric light in 1808 by passing battery current through a platinum wire. But the
1879: Thomas Edison crowns 14 months of testing with an incandescent electric light bulb that lasts 13½ hours.
Sir Humphrey Davy had produced incandescent electric light in 1808 by passing battery current through a platinum wire. But the