Page:Incandescent electric lighting- A practical description of the Edison system.djvu/136

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125

mum when lamps having an efficiency of 3.1 watts per candle are used.

Thus the maximum efficiency of these

Lamps $1.00 each-Life 600 hrs. at 3 Watts per Candle.

Current costs 10 cts. per ㏋. per hour.

Fig. 4.

lamps under the conditions assumed is 3.1 watts per candle.

The lamps considered in the case shown in Fig. 4 cost $1.00; all other conditions