This bulb has a carbonized split Japanese bamboo filament with the ends connected to the inner leads by a copper-plated platinum junction. It also has a base similar to that of previous bulb in production [see A15]
except the collar is eliminated and the base looks much more like today’s modern day base. Thus the bulb had to be hand-held by the glass bowl to place and turn the base into female screw of socket. This bulb was manufactured in 1884.
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