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Distribution: Light Bulbs

Tantalum filament bulb, ca. 1904

Tantalum filament bulb, ca. 1904

Item 74869 info
Maine Historical Society

In the search for greater efficiency and more light, for less cost, German inventors von Bolton and Feuerlien developed a filament made of element number 73, Tantalum, which had almost the same efficiency as metallized carbon, but was superior in strength. This lamp produced 5 lumens per watt.


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