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are the same as in the case shown in Fig. 3. This increases the total cost from $783 to $800, and necessitates using lamps of 3.18 watts per candle instead of 3.1,
Lamps $1.00 each-Life 600 hrs. at 3 Watts per Candle.
Current posts 5 cts. per ㏋. per hour.
Fig. 5.
to make the cost of operating a minimum.
In the case shown in the diagram. Fig. 5, the current costs 5 cents per h.p. per hour; the other conditions are the same
