1879 to 1880

The first commercial light bulbs produced by Edison in the winter of 1879 to 1880 did not have threaded bases as we know them today.  Instead they had a plain neck with two copper strips on opposite sides of the neck.  The neck was simply plugged into a wooden standing base as shown in the photograph.  Another method of securing a light bulb was to mount it into a socket (which was simply a hollowed out piece of wood) and tighten the thumbscrew to secure the bulb.  With this method the light bulb did not have to be sitting on a table or mantle but could be affixed to a wall or the ceiling.

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