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case, other conditions being the same. The minimum total cost is $400, and the maximum efficiency 3.175 watts per candle.
The curve, Fig. 11, illustrates the case
Lamps 50 cts. each—Life 600 hrs. at 3 Watts per Candle.
Current costs 5 cts. per ㏋. per hour.
Fig. 10.
of very cheap and very good lamps, with moderate cost of current. The minimum total cost is low, $294, while the lamps are run at the high efficiency of 2.38 watts per candle.
