DURALUMIN -
A modest, yet important invention, is the production
of a metal alloy, having the same weight as aluminum, yet
possessing the same tensile strength as medium steel. It is
similar appearing metal as aluminum, and takes a brilliant
polish identical to nickel plating. The specific gravity is
2.8, while the melting point is 650 degrees C.
It is easily machined, and can be obtained in bars,
sheets, and rods of any dimensions. It can also be supplied
in any special shapes desired. The demand for such metal
should be particularly strong from airship builders, aeroplane
constructors, and all parties seeking a strong and light
construction material.
THE INTERNATIONAL AMPERE SIGN -
The algebraical sign "C", which has been in use for
many years, has recently been changed to "I", which will be
the recognized sign used in denoting amperes in equations.
A NEW MARCONI RECORD -
On November 19th (1911), the following message was
sent from the new Marconi station at Coltano, near Pisa (Italy),
to the Glace Bay (Nova Scotia) station, a distance of approxi-
mately 4,000 miles in an air line.
"To the Editor of The New York Times:
My greetings transmitted by wireless telegraph from Italy to
America. G. Marconi, Pisa
5:47 P. M."
The Coltano station has been built for the Italian
Government so that it may be in wireless communication with the
Massowah station in Africa. The New York Times has always
displayed a great interest in wireless, patronizing the Clifden
and Glace Bay stations for its trans-Atlantic press messages.
Owing to the large Italian population in Argentine
Republic in South America, the Marconi interests have been
planning the erecting of a high powered station in Buenos Aires,
which will be in direct wireless communication with the station
at Coltano, the distance being almost 7,000 miles.
THE RADIO CLUB OF AMERICA - (from 'Modern Electrics and
Mechanics' - January, 1914)
The Radio Club of America, just completing the fifth year
of its existence, wishes to announce to all who are practically
interested in the science of radio communications, and whose
researches have been retarded by lack of acquaintance with others
similarly interested, that here is an organization whose object
is to bring such men together.
As the Junior Wireless Club, Ltd., it was among the first
organizations to take a definite stand in the defense of the
amateur against unsatisfactory legislation, sending a delegation
to Washington in 1910.
Although the club was at first purely composed of amateurs,
membership has in recent years been greatly increased by a score
of professional operators, university graduates, and business
men, interested in wireless. The club has as a consulting engineer,
Prof. R. A. FESSENDEN. Several of the members have made inventions
of no small note.
Meetings are held monthly, and an interesting program always
is prepared for the occasion.
Applicants for membership are passed upon by a committee,
and the name is then submitted for the approval of the club members.
The secretary, GEORGE BURGHARD, 1 East 93rd Street, New York, will
be pleased to answer any inquiries.