e 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.

As an introduction, I shall mention a few historical facts, but do not
propose to write in this article even a short account of the different
automatic systems, and I must assume that my readers are familiar with
modern automatic machines and appliances.

In 1870, upon the completion of the Automatic Company's 7 ohm wire
between New York and Washington, it happened that Prof. Moses G. Farmer
was in the Washington office when the first message was about to be
sent, and upon being requested, he turned the "crank" and transmitted
the message to New York, at the rate of 217 words per minute.

Upon his return to New York he co-operated with Mr. Prescott in
experiments on W.U. wires, their object being to determine what could be
done on iron wires with the Bain system. A good No. 8 wire running from
New York to Boston was selected, reinsulated, well trimmed, and put in
first-class electrical condition, previous to the test. The "Little"
chemical paper was used.

The maximum speed attained on this wire was 65 words per minute.

About the same time George H. Grace used an electro magnet on the
automatic line with such good effect that the speed on the New
York-Washington circuit was increased to 450 words per minute.

Then a platina stylus or pen was substituted for the iron pen in
connection with iodide paper, and the speed increased to 900 words per
minute.

In 1880, upon the completion of the Rapid Company's 6 ohm wire, between
New York and Boston, 1,200 words per minute were transmitted between the
cities above named.

In 1882, I was employed by the Postal Telegraph Company to put the Leggo
automatic system into practical shape, and, if possible, tran