[Illustration: FIGS. 2 AND 3.]
Finally, when the telephone is unhooked, the inductor, J, and the bell,
W, are thrown out of circuit, and the telephone is interposed between d
and i, that is, between L and T.--_La Lumiere Electrique_.
* * * * *
THE GERARD ELECTRIC LAMP.
In the Gerard incandescent lamp the carbons have the form of a V. They
are obtained by agglomerating very finely powdered carbon, and passing it
through a draw plate. At their extremity they are cemented together with
a small quantity of carbon paste, and their connection with the platinum
conducting wires is effected by means of a cylinder of the same paste
surmounted by a cone. These couplings secure a good contact, and, by
their dimensions, prevent the attachments from becoming hot and
consequently injuring the carbon at this point. The cone forms a
connection of decreasing section, and prevents the carbon from getting
broken during carriage.
This process of manufacture permits of obtaining lamps of all
intensities, from 3 candles up. The following, according to Mr. Gerard,
are the consumptions of energy in each size of lamp:
Candles.
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