independent, it becomes easy to light or extinguish any one of the lamps
at will. Since the conductors are formed of ordinary simple wires, the
cost attending the installation of 12 or 24 lamps amounts to just about
the same as it would in the case of a single cable.

[Illustration: GERARD'S 250 H.P. DIRECT CONNECTION ALTERNATING CURRENT
STEAM DYNAMO-ELECTRIC MACHINE.]

One of the annexed cuts represents a Corliss steam engine connected
directly with an alternating current machine of the system under
consideration. According to the inventor, this machine is capable of
supplying 1,000 lamps of a special kind, called "slide lamps," and a
larger number of incandescent ones.--_Revue Industrielle_.

* * * * *




AUTOMATIC FAST SPEED TELEGRAPHY.

By THEO. F. TAYLOR.


Since 1838 much has been done toward increasing the carrying capacity of
a single wire. In response to your invitation I will relate my
experience upon the Postal's large coppered wire, in an effort to
transmit 800 words per minute over a 1,000 mile circuit, and add my mite
to the vast sum of knowledge already possessed by electricians.