The matter was always carefully counted, and the utmost care taken to
obtain correct figures.

It may be mentioned as a curious fact that we not only send 1,200 words
per minute through 1,050 miles of overhead wire and five miles of
underground cable, but also through a second conductor in No. 2 cable
back to Thirty-ninth Street, and then connected to a third underground
conductor in No. 1 cable back to Chicago main office, in all about
fifteen miles of underground, through which we sent 1,200 words per
minute and had a splendid margin.--_Electrical World_.

* * * * *

[ELECTRICAL REVIEW].




THEORY OF THE ACTION OF THE CARBON MICROPHONE--WHAT IS IT?


A careful examination of the opinions of scientific men given in the
telephone cases--before Lord McLaren in Edinburgh and before Mr. Justice
Fry in London--leads me to the conclusion that scientific men, at least
those whose opinions I shall quote, are not agreed as to what is the
action of the carbon microphone.

In the Edinburgh case, Sir Frederick Bramwell said: "The variations of
the currents are effected so as to produce with remarkable fidelity the