[Gutenberg 50588] • The Fifteen Watt Tungsten Lamp

Excerpt from The Fifteen Watt Tungsten Lamp: Thesis Submitted in Partial Fulfillment of the Requirements for the Degree of Master of Science in Electrical Engineering in the Graduate School of the University of Illinois, 1912

The total number of 15 watt lamps tested was 2m, one half of Which was obtained directly from.the manufacturer and the other half bought in open.market. It is well to mention at this time that this may have been the cause of the different qualities as brought out by the life tests.

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