ELECTRICITY.

Conductors, 1 per cent. $160.00

Engine and dynamos, 5 per cent. 525.00

Cars, 10 per cent. 5,280.00

Roadway, 10 per cent. 2,007.00

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Total. $7,972.00

Scientific American Supplement, No. 611, September 17, 1887 · 第 11 / 52 题