The workingman's advocate. [volume] (Chicago [Ill.]) 1864-1877, 1873-03-22

with strips Of tinfoil, so that by illumin-
atlng the spaces by the electric spark, let
ters and figures can be exhibited He has
two wires for each letter, and in all IA
wires, between the stations
1896. Saliva presents to the Academy Of
Madrid a plan Of an electric telegraph.
which was adopted and patronized
1896. Volta discovers contact electricity
1896. Csvallo gives signals BY means II
discharges Of a battery Of Leyden jars over
long wires.
1900. Volta invents the Noltaic pile, or
battery.
1909 Soemmering decsmposss water BY
the Voltsic pile, in 80 tubes, each connect
ed by wire to the battery; each wire had
the same letter at either end
1913. Schwelgger reduces the number Of
wires to 2, and a single tube the letter Il
indicated by the number Of seconds that
the current is closed and the gas evolved,
according to a signal book.
/ 1876. DIR. J. k. Coke, of Philadelphis,
proposes chemical telegraph.
1916 Ronalds, Of England, makes si.-
mails by moving pith balls on the faces Ot
sychronOus clocks 3 miles of
1919. Oersted, Of Copenhagen, makes
the great discovery that the compass nee
die places itself at right angles To the cleo
trlc current.
1920. Schyeigger, of Halle, and Poggen-
dOrf, Of Berlin, discovers that the effect Of
the needle may be increased by colltng the
wire around it, and the galvanomcter was
invented
1920. Arago, of France magnetized All
iron bar, or needle, by placing it IN a long
spiral coil Of wire transmitting the current,
and POUNDS the electromagnetic theory
1920 Oersted proposes a needle tele-
graph.
1921. Ampere experiments with the
same, and improves it.
1923. Ronalds, Of England constructs 8
miles Of electric telegraph, with a movable
dial carrying the letters.
1925. William Sturgeon, uf London,
coils copper wire around a soft iron horse
shoe, and made Il magnetic by passing the
Voltaic current He hfed pounds
1927 Ohm, ~ Berlin, tinds the mathe-
matlcal laws regulating electric currents
1927 Harrison &. Dyer, of Now York
makes signals by discoloring test paper by
the current 2 miles Of
York AthenBum Surgeons electo- o-ma4net
and shows how the opening and closing Of
the battery Will cause the falling aud restO-
ration Of the armature r. s. Prof
Morse was present at this lecture
1928 Mol, Of Holland makes an cleo
tro-magnet, lifting and dropping l45 lbs
weight.
1929 Prof. Henry proves that an cleo
tro-magnet may be charged al great dis
tances
1880. Prot. Henry produces Al electro
magnet Of great power, lifting more than
ton
1881 Prof. Henry devises the hrst r.
ciprOcatlng electro-magnet, vibrating arma-
ture and relay magnet, all Indispensable III
the Morse system.
1882. Prof Morse, Of New J ork, claims
that he worked out the general plan Of bis
telegraph. and prepares the apparatus tO
test IT,
1884 Weber and Gauss establish an
electro magnetic telegraph III tioettmgen,
and use it for all the purposes II scientific
communication between the occupants W
the Physical Cabinet IN the University and
the distant observatory
1888. Prof. Morse applies the relay uf
Prof Henry u telegraphy.
1886 Daniel, Of London, invents the
constant sulphate Of copper battery, with
porous cells.
1886. Cook, III England, sees the Shit
ling telegraph at HeIdIeburg, Germany,
and conceives the idea of an Improvement
on IT,
1887 He brings out with MILESTONE. in
England, telegraph IT compass needles
and coils, and . Or wires
1887. Cook and Davenport construct an
electro magnetic motor.
1887. Jacob, IF Petersburg, propels
boat on the Neva BY an electrU-magnrtic
engine.
1887. Grove, Of London, nvents the
platinum and nitric acid battery, with pOr-
Gus cells
1887 Steinhsil, of Munich, dispenses
the return current by burying large cop
per plate at each station, with which the
circuit wire communicates
1887. Oct g. Prof Morse files caveat
in the Patent Office, Washington
1888. Prof NOrsselman de Heer. NJ
Deventer, Holland, invents the electro
physiological telegraph.
1887 April 7. Prof. Morse makes M
first application for patent
1889. r. Coombs builds an electric tele-
graph on the principle of the modern ho-
tel annuncistor, with 36 wires aud 5O let-
ters and figures and obtains thr first pre-
MUM at the New York Far
1840. January r Coombs exhibits his
electro magnetic telegraph ana small cleo
tro-magnetlc locomotive On circular rail-
road track, in operation M Washington, u.
q. See National Inteiiiyeacer of January
q, lS4O
lo40 June Patent to Prof Morse fur
electrn magnetic telegraph issued
lS4O. Jould, of England. constructs pe-
cuhar shaded electro magnets of great AZ
tractive power.
1912 SillIman, Jr, " New Haven, tn-
vents plumbagO battery.
l842. Bunsen, Of HeidleDurg, mvents
the carbon battery.
lS44. First telegraph W the United
States in operation between Washington
and Baltimore, under Morse patent
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