The sun. [volume] (New York [N.Y.]) 1833-1916, 1894-11-18
A EoVEL USE FOR TELEPHONES
To Bring from the bowels or tho Earth
warning OF Coming Earthquakes.
From he 81. Louie Globe Democrat.

MEXICO CITY, Nov. lI.-Sehor Francisco Es-
trada. professor of physics In the state College
OF san Luis Potosi. has submitted an original
plan To the Government for foretelling earth
quakes IN tho volcanic zone OF Mexico, by means
which visited the Valley Of Mexico On the I'd
inst, killing eighteen persons, he has made q
their preceding signs. He had been making a
long study OF means OF prediction for these de-
stspeiiye disturbance, ana Is sure he has made
appreciated by the inhabitants OF the volcanic
regions, In the course OF his very interesting
with the telephone. and the more recent In
~vention, the micrOphone, and with daily stimuli
which comprises Vera Cruz. Pueblo. Mexico,
and Guadalaisra, l believe II possible to deiin-
eruptfons, as the result OF tho great interior
changes of the earth, which change the geolOg-
zeal construction OF our land; The noises that
earth to complete the circuits, noises hitherto
unexplained, believe, from my repeated obser;
causes, atmospheric electricity and underground
electrical currents, which como from depths
easily distinguished by exterior signs. such as
storms, thunder. lightning, &c; but, there are
noises like murmurings, sand storms, blows or
the rubbing Of a rough body upon the instru-
ment are, heard at the telephone. As this instrq-
suitable for the recognition Of the approaching
chronological phenomeha which cause such
great terror 10 the inhabitant OF volcanic zones.
propose the rational study OF these phsnonenA
By the following plan:
Reconstruction OF various telephone lines; let
one connect the central GOVERNMENT MeteorO-
logical Observatory with the base OF the volcano,
Popoeatapetl, being grounded IN one OF the
deepest cracks or creyasses, selecting among
them one containing a thermal spring, connect
ing the other end Of the line at the observatory
with the metallic tube Of one OF tho deepest
Rrtesian wells in the city. Another line should
run from Puebla TO the same mountain and then
oonneet Guadalajara with the yolcRnQof Colima;
and later lines should be run to the peak Of
OTlzuba, the COfFe de Perote, and tho Jorutle
volcano. l would place AZ least two telephones
and one vertical galyanOmeter At soIne con-
yenient spot midway In the telegFaph lines from
Vera Cruz 10 Pueba, from Pueblo To Mexico
City, TO GuRdalajara, and GuadalaJara 70 san
BIAS, or some other Pacific port that has a tele-
graph office to take daily Observations with the
telephone. In each one of these branches or
sections. and with all the lines connected as
often as possible without interfering with this
service Of the wires, the placing in the Ohserya-
tories at Mexico. Puebla, and Guadalaiara u a
simple icrophuue coIlused 81 "A carbon pendu-
lum suspSnded On q 90 sp!r9l wire 80 arranged
thai IL will close an electric circuit at tho slight
est motion, and set an electric bell 10 ringing. in
order 70 record the slightest movement or the
earth.
"If properly handled, by these means the
oTuptiOns Of any volcano and earthquake naignt
b fOTetOld mAnF DAYS W sdYAno~"