New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1872-05-29
SCIENTIFIC.
SuBMA-

Nrw Recording INSTRUMENT FOR SUBnA-
,,xr rEIEeRAPHs-Untn quite recently, tho only teie
ranhic instrument which could DO used In connection
th the very feeble electric force manifested through
png submarine cables, is that known as tho mrroresr
gauometer by which a spot of light is mace 10 ioo,
as movements every variation In that force; anu -,
varying strengths being followed by the eye o 60
,pterpreted under circumstances in which ORDINARY w
,r,nhic Instruments indicating the mere presence u
.ence OF given current would be useless A"0 80,
NJ this mirror galvanOmetcr, Sir william ino'NpS
invented another instrument that recoroS ."o 49,.
ted message. 1t is now in practical oPei"s - tt A.
minus OF tho French cable of Du1oury' Na9' 10 -
,, dr,vgs or marks on strip of paper curved OF
broken line giving graphic representation oi 'ho vary
mo strength OF the current or II redureu' VI oie0'
otental at the receiving end OF the caoie anu scs
record Of every feature OF the enees uue "
tho sanders action. The instrument Is available lor tue
,.,om of varying strength. including, OF course inc
SIMPLEST system viz. of two strengths called positive
d NEGATIVE or for the system OF long and short sig
mails Of which the alphabet is the simplest type
The difficulty in producing such recorder as TINS mas
hen due TO the dcuty OF obtaining marks from very
light body in rapid motion without Impeding thaV nv
ZION To effect this tho inventor connects tether by
direct attachment by q stretched thread or noel "
the body moved by the received currena light markng
noodle OF tue from the end Of which ink or other nd
Is suurted upon paper The signals which are to DC re-
corded give rise 10 motions OF the marking end WnGn
are parallel 10 the plane OF the paper VINE tno nanen
drawn along ia its plane, and in dectoh PIPr,
diculor Ia file line OF the motions caused by signals
Snplovs FOR the mqringneede, by preference, Capri
larry tube briste dipping ~ one en- - sncb
ory reservoir Of ink other hud ana ne causes suon
6u 10 be spured from or drawn from the opposite Gnu
NV means OF an electric force, or by means OF ral VI
bratons maintained the needle or in the paper IN
direction perpendicular to the plane OF the paper.
vibrations he maintained mecnaneait . Ie pancr
natcaly. by the agency OF sound so aI tie p on
RECEIVES ink by succession of fine contacts DelWcen
each OF which the tube briste is quite lTee 20 %
When the electric method Is used the pfI @ and the
over "A metal plate electrified say posi- anu = ~
capillary tube negatively, ana oWeii,'i IA thf Ioet9i
nlote such as would tend TO cause suettSsio ~,
of sharks 10 pass between them, ana "niSn'
the circumstances, produce tine sIream OF Lna,
o succession OF fine dots spuIteu Foln W W , t M
the paper leaving record OF the position ol te 90
each instant and drawing sSnsiDs t otioo nf
paper without impeding Nv ulcilo tIo ~ hos
Tho tube directed by the receiving instrument II mas
bcen found most convenient 10 iSt me p4Sa IN, its
vertical plane, and TO use small gass sho' & I
short lel, dipping IN the ink reservoir ana us was
pointing 0Oquely downward at the paper aug CoS ~
It, The receiving instrument used III ol,'-tlu , a.
mis- marking apparatus IS peculiar arrangement ln
which the received current passes through u NeI
col OF small number of turns Of line wire: Fart Oh
netlc field, produced by permanent maEleis, OF
nv electrC-uagnets, which with great force
on inc coil when the current passes through
H. The coil IS kept still, without any complete lItne
work or boebn by the 9se OF sun P E' etretcin1
20 fixed points. and serving TO support inc COZ VIII
giving IL the requisite freedom 10 move i!iu ore ~
pnpgraus appears like a continuous lno but Wbeh Elk,
AHMED closely it IS found 10 be made upo sIles Oh
S,pds 10 ssees i'm the Morse alphaoet made by
breaking the current, and the 10 ana iIo IdsNt -
which may long short. as the cable current varies
in etfeneth accomplish the same purpose as Inc uot ana
limo made by the Morse pen. Thus the swinging nlo-
mum expenditure OF IoIee. inc thIE9 i ,,oS Gee
p'I,led what deemed an inppsslphtI ny mo7
irciars and brought ont an Instrument when Is n2t
only theoretically correct in its construction, Dut WHICH
has been found TO work well in actual practice