The lamp also contains an automatic safety device for
preserving the continuity of the circuit in case of accidental injury
to the feeding mechanism or the carbons of the lamps. This is quite
important when a considerable number of lights are operated upon one
circuit wire, as a break in the circuit, due to a defective lamp,
would result in the extinguishment of all the lights. With the safety
device mentioned, such a break does not occur, but the flow of current
is preserved through the faulty lamp.
By an exceedingly simple device upon the carbon holding rod, the lamps
are extinguished when the carbons are burned out, and injury by
burning the holders completely avoided.
The system is based upon the joint inventions of Elihu Thomson and
Edwin J. Houston, for generators, regulators, and electric lamps, and
also the patents of Elihu Thomson, in generators, regulators, and
electric lamps; all of which are now operated and controlled by the
Thomson-Houston Electric Co., 131 Devonshire Street, Boston, Mass.
* * * * *
A MODIFICATION OF THE VIBRATING BELL.
One of the causes which gives rise to induction in the telephone lines
running along the Belgian railroads is that there are so many electric
bells in the stations.
Mr. Lippens proposes as a remedy for the trouble a slight modification
of the vibrating bell of his invention so as to exclude from the line
the extra currents from the bell.
In one of the styles (Fig.
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