The Washington herald., 1909-01-31

AEC ~ A0u AZ ~
written message he presses a button
which lights red warning lamp on the
Transmitting desk II is not necessary
that there should be an observer at the
receiver, for the receiving mechanism Is
controlled from the transmitteT, and once
in operation the written message can be
continued until the paper roll is ex-
hausted. In practice the user Of the
telewriter rings up on his telephone
circuit in the ordinary way. and II he re-
ceives no answer he hangs up the tele-
phone pulls over the pencil lever 10
send and writes his message.
Two wires such as ordinarily used for
telephone circuits are needed TO operate
the telewriter. When a third wire can be
employed the third line is used for oper-
ating the pen-lifter direct, thus dispens-
ing with the alternating current and It's
apparatus. An installation can be worked
without batteries when a direct current.
as from an electric light supply. Is
available When the supply is alternat-
ing an aluminium recJifer and battery
are used. When desired more than one
receiver can be operated from the same
transmitter. and naturally any number
Of instruments can be linked Up on an
exchange system.
French Letter kilograms.
An innovation IN the French postal
service was inaugurated recently when
from certain Offices in France and Cor
sica letter kilograms paid in advance
were transmitted by wire during the
night at the rate Of one-ffth Of a cent a
v-o-1 ~ r-evz-o 90, ara To-vro ~r7ez ~
charge Of less than ten cents The mes
sages are sent out as mail matter By the
early deliveries. The letter telegram Is
an experiment and it continuation viii
depend upon the extent the public ayails
Itself Of this opportunity Considering
the low rate provided, and the immense
convenience 70 business interests that
admits or lengthy messages being sent
az the close Of a business day and re-
ceived early the morning following AT
points two or more days distant, perhaps,
by ordinary mail facilities, as Is the case
when letters are sent from Corsica 70
Paris. and twenty hours when sent from
the southeastern section Of the capital
Between cities not on a main line con-
nection much practial convenience will
result. since the length Of time required
by ordinary postal service across even
comparatively small distances in France
not directly connected Is often too great
10 admit Of a letter mailed at night
reaching its destination on the morning
Of The following DAY. II is estimated
that an apprecisble portion OF the pat
rOnage viii come IN this way The in
terest demonstrated generally by business
men and their impatience ar the delay
that followed the first official intima-
ton as 20 the date Of the Inauguration
Of this experiment indicate that there
Is every prospect Of financial return
that will warrant this method being de-
creed a permanent service.
Diamonds by a New Method.
At one Of the approaching seances Of
the Academy OF Sciences a communica-
ton will be read from a French chemist.
containing a formula for the manufacture
Of artificial diamonds. The secret for the
making of these stones has been COM
mitted to writing and is now deposited
in a sealed envelope which has been con-
fided TO the secretary OF the academy.
Il appears that the chemists interesting
discovery was accidental The diamonds
manufactured BY him were submitted 10
minute examination by Prof. Lacroix
and II. Leon MsqUenne, a member ~
the French Institute. and were declared
10 be in every respect Identical with YER
liable diamonds. NJ Maquenne burned
twenty-One Of HIS diamonds in order 10
ascertain whether they were composed
OF pure carbon. and Prof I4acroix
had q dozen more placed at his disposal.
The diamonds we're diminutive. but the
smallest was larger than any obtained
by the late n Henri Moissan In his cleo
{ tTic furnace. VI Msquenne Is Of the Opin-
| ion that --ie method employed by the
/ new diamond maker. which is entirely
different from that OF Mr. Molssan. Is a
costly one, and doubts whether IL could
be made to pay. The chemist, however,
/ has been furnished by a group Of finan-
/ ciers with sufficient capital TO continue
his experiments.
Underground Telegraph Cable.
Considerable progress has been made
by the British postal authorities with the
scheme commenced some two years
ago for improving telegraphic and tele-
phonic communication. in connection with
the work of laying underground tele-
graph and telephone cables. Newcastle
/ on-Tyne is ultimately TO be connected
/ with the main underground telegraph
/ system OF the country by the means OF
/ a line. by way OF Durham and Stockton,
10 Leeds. which is served via Bradford
| by an underground spur out Of the main
( London-Giasgow telegraph line The
I Newcastie-Durham section of the line
! has been in use since March last. and
/ the Durhana-Stockton section VIII be
| completed shortly. Underground lines for
: telegraph and telephone purposes be-
tween Newcastle and North Shields and
/ between Newcastle and Sunderland are
I in course Of construction. and the work
/ Of providing a Newcastle-South Shields
underground route viii shortly be begun.