132
In the case shown in Fig. 12, the cost and quality of the lamps are the same as in the previous case, but the current costs twice as much. This increases the minimum
Lamps 25 cts. each—Life 2400 hrs. at 3 Watts per Candle.
Current costs 5 cts. per ㏋. per hour.
Fig. 11.
total cost from $294 to $535, and raises the maximum efficiency to 2.14 watts per candle.
In the case, Fig. 13, the cost of lamps and the cost of current are the same as in
