1, which will explain itself almost at first
sight.
The troughs are made of mahogany, put together with brass screws, and
well saturated with an insulating compound which also makes them acid
proof; the cells are charged with a saturated solution of bichromate
of potash, to which has been added twenty fluid ounces of sulphuric
acid to each gallon.
[Illustration: FIG. 2.]
To produce the electric current, all that is needed is to lower these
suspended elements down into the trough, having previously connected
the wires as shown in Fig. 1, to the electric lamp, Fig 2. At once a
light starts up, between the carbon pencils, of a thousand-candle
power or more. With a light of this power, a large head on cabinet or
carte size plate may be produced in three or four seconds.
The generator occupies a floor space of three feet six inches by two
feet, and stands two feet six inches high. The cells will cost 5s. to
charge, and will produce upward of sixty negatives before being
exhausted. All that is necessary, in recharging, is to lift the
elements up out of the way, take out the troughs by their handles and
empty them, charging them again by means of a toilet jug. When
replaced, the whole apparatus is fit for use again; the whole of the
above operation occupies but a quarter of an hour, and as there are no
earthenware cells employed, there is no fear of breakage.
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