The Milan exchange. (Milan, Gibson County, Tenn.) 1874-1978, 1878-11-21
zaTERfcANFi DISPLAY At THE
PARIS EXPOSITION.
wonders of the Mechanical DEPART

r. 4fllI ments
acfgs From the London Times, Aug. z.
srsz * - Pt.rlftis, however, the most I'M
poltantsdis. hay in this rdeoaEtInent, ali Things
cansideIel, is that Of the Naltham Watch
Comp ny, their first in the Euro can exhibit
tons The rr.ftfers of the Times reports OF
the Philadelphia Exhibition wal not need 20
be- in orEied cf the adm rable machinery by
.gFiGCI toe works OF the Waltil1m watches are
produced, or their singular tXactltude, when
enables any part OF a watch to be replaced BY
the corresponding piece OF any other wdich OF
the same grIde In this mechanical lrOduc-
tIotfssfr machines, America has long led the
world and sthas m eschInism BIZ which the Eli
~ lisa, arG.yriilel is still produced IS with I'M
ilale iialf mod ticatiO1s o contribution nom
1 fhe American aTniOries. But in the Naltham
works science has been brought to she
aid Of native ingenuity to such degree that
even sine. the Philadelphia Exhibition the
} fainieatfoai of watches has gone through
-ldrge. sTth OF another revolution. What was
~ gua hy applying slseh MACHINES that their
work was beyond competition on anything
ike eaual terms from any hand-work Is con-
tinucd hyfhe construction OF the most essen
dttal parts OF awatchon ! new principle, when
l0lr,stiIs. an approach to perfection unattaln-
arle by the dld mechanism, however pro-
aueed. Every Ole knows that the great dilll-
ctrtV in iliak.ng chrOnOmeters has Teen the
c6tlf, ensatiun for sae effects of expansion ana
contraction due to change OF temperature;
Gully is due itsStO The balance, which, ny us
cons fiuctiOn With q bi-segmental rim (Oi brass
ana stecit, may be perfectly corrected, than
10 the exgSnsiOn OF the balance or hair
sprIug, which, Leiu- Immensely longer, causes
siee times tile error caused by the eXt anslOh
7,T -cuaiFactlon balance-whcol alone Inc
. Igo ieees must be considered as one,
AID The Compensation effected IN the wheel
or iIit. i..J!si answer for the spring as well As
,ur itself. The theoretical and insuperable
i.liicuiIy in THIS compensation has dla az oeeii
that tile error caused By the expansion and
e,ntrsctioit OF the spring was IN different
fafiO fropl that OF the correcting expansion or
contraction wheel and the TWO quantities may
| &c Ilbareal ~ curves with two radIi, when
! c9uid be brought together at TWO points, bub
not to coincide throughout, so that If the com
\ ensation at the extremes OF temperature Is
sFreet, the mean must be in error and UIee
1 sTsL3[ .r-.a- ...t.
The OldcompensatiOn was, speaking broad
| :, in brsziug 4 band of brass on one of steel,
| / process BOTH theoretically snd mechanically
/ erroneous, since the contraction and eXpan-
sion can only 20 on with u certain tendency 70
SisFupttn OF the elements aud consequent in
4 qlEflI ty- OF the action. The new balance pro-
| credsou aneHtITeiy different arrangement of
/ he cOmPeDsa;ing metals. The I'm, OF plain
| tel, is cutrEcafly thruu-h at Tie fixed ex-
uemiIirs Oh the semi circles by several
tasavs- tooth shaped Hotches, the number &c
! ,iermiHea by experiment, and the brass Is
i ,0rcesi into these EOtches. The cOmpensat-
I ing weights are then PUT on at tie other
eXtIemities of the semi-circ,es instead of be
iny Distributed along them empirically, and it
IS louEdrre tle ipthis aJTang ement 50 TO dis
/ tribute the compensation and compCnsating
Weig hts as to give at Will a compensation for
the mean tenn efsture either in excess Of, or
il Sc than the extremes, and of course, to give
a cCmpeusfti6n which shall coincide through
out; which makes il theoretically possible to
} Give Daolntea CONDENSATION for all tempera-
lures at once. 1t is difficult to make this
ciear, without diagrams showing the exact
b curves attained by experiment; but the nature
-of the result viii be appreciated by those who
know the mechanism Of the balance. It is
simply the theoretical elimination OF all error
from the compensated balance so lar as tenn
= peratrre is concerned. Practically and me
chanicallY there VIII always lie some, due to
the inherent imuerfect on OF human workman
ship but tits belkved that the mean error, and
! equally the Eil AL tinentrequred viii be
reduced to Oue-third OF that actually obtaining
biunGef theofd form of balance But TO illustrate
how involved are the various improvements in
mechanism it may be noted that the delicacy Of
construction OF the new balance would only
have beer possible with the mechanism intro
duced by the Natham Company, the precision
ofiwhich maybe judged from that OF the Iii
crOmeter last produced and shown at Paris,
which measures the twenty fve-thOu andth
part OF an inch, and even ind Gates that so
largely that it might be divided under lens
readily into hundred thOusandths. a mi
crometer screw gauge detects inequalities in
the tGeal of a screv up to hundred thou
niefft Scienttic Commission TO correct the
measures has been constructed in which the
nGriD,lut 81 error in the thread IS less than Que
trn-thousaudth Tart OF an incn-
-Perhaps nine-tenths of womankind