This lamp exhibits great elasticity, and can operate, without a
change of any part of its mechanism, with currents of very different
intensities. It suffices for obtaining a proper working of the apparatus
in each case, to regulate the distance from the weight, P', to the point
of suspension, O', and the distance from the armature, _p_, to the
cores, F. At the Champs Elysees concerts the lamps are operating with
alternating currents; but they are capable of operating with continuous
ones also, although the slight tremor of the electro-magnetic system,
due to the use of alternating currents and as a consequence of rapid
changes of magnetization, seems in principle very favorable to systems
in which the descent of the carbon is based upon friction instead of a
clutch. At the Champs Elysees concerts the lamps burn crayons of 9 to
10 millimeters with a current of 9 to 10 amperes and an effective
electro-motive power of 60 volts per lamp. The light is very steady,
and the effect produced is most satisfactory. The dispensing with all
clock-work movement and regulating springs makes this electric lamp
of Mr. Mondos a simple and plain apparatus, capable of numerous
applications in the industries, in wide, open spaces, in all cases where
foci of medium intensity have to be employed, and where it is desired to
arrange several lamps in the same circuit.--_La Nature_.

[Illustration: Fig. 2--REGULATING MECHANISM.]

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[AMERICAN POTTERY AND GLASSWARE REPORTER.]