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Scientific American Supplement, No. 288, July 9, 1881 by Various
page 127 of 160 (79%)
lamps were not all good, and it was found that they required careful
adjustment, but when once they were got to go right they continued to
do so, and have, up to the present, shown no signs of deterioration,
although the time during which they have been in operation is nine
months.

The first outlay has been as follows:

Engine and fixing, including shafting and
belting................................ L420
Dynamo machine......................... 400
Lamps, apparatus, and conducting wire . 384
------
L1,204

The cost of working has been, from June 22, to December 31, during which
period the lights were going on 87 nights for a total time of 359 hours:

L s. d.
Carbons............................... 18 9 0
Oil, etc.............................. 4 11 6
Coal.................................. 11 14 0
Wages................................. 34 7 6
----------
L69 2 0

being at the rate of 3s. 10d. per hour of light.

Now, the consumption of gas in the court would have been 4,800 cubic
feet per hour, which, at 3s. 4d. per 1,000 cubic feet, would amount to
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