Sharp County record., 1878-12-05
AMERICAN DISPLAY ~
PARIS EXPOSITlOSS a
Wonders of the Mechanic,
ment,

ua'"allltall
From the London Time,
4 X Perhaps, howaros' AeSs 51
portan. display in this densr,,,, u; ~
considered, is that of the Wall SVJ I .uu
Company, their first in the P%aaH
tions. The readers of the ~ TTulO "a III
the Philadelphia Exhibition Am% S,S
be informed of the admrabla l"Il y
which the works of the Waltz Wie lla
produced, or their singular ra,a evaui, y ~
enables any part of a watch to '@S'l /. 4
the corresponding piece of any ", vi IA
the same grade. In this mesba bO'la r
tion OF machines, America Ssa Si'1 v
world. ana the mechanism hv ~ lv- no
ghSh army rifle is still prodnooII "I IAN
material notifications a com,,st ".
the American armories. Bntinw
works science has been bro~; ~ ~; p's
aid OF native ingenuity to sucb Oh
even since the Philadelphia Frt9 ,el
fabrication or watches has gn14 nAl -,
large arc of another reyolntion u' H''
begun by applying such machine, ou
work was beyond comletition =, Dsl
like equal terms from any band M
tinued by the construction of t6a -
tial parts OF watch on new nri,1 mi "
permits an approach to perlect% he
able by the old mechanism h.. ha
duced. Every one knows thai ,GV GV'
Gully in making chronOmeters bs,
compensation for the effects of eyr.. M i9l
contraction due to change of flr Pi
but what is less well kncwn il tb,, % q
Guilty is due less to the balance rt; II.
construction with a bi-segmenta r- ~
and steeD, may be perfectly corn. {
10 the expansion of the 6alancs n
spring, which, being immensely lon,, In
five umes the error caused BY lba, z" p
or contraction balance.Wbeel a,r ~
two pieces must be considerei ,st
and the compensation effected in V]
or Tim must answer for the spring a :.
for itself, The theoretical and h, T..
difficulty in this compensation hasa, hl
that the error caused by the eynm, tr
contraction of the spring was N hi,
ratio lIOm that OF the correcting er,f T.,
contraction wheel and the two Oun, 0'' a'
be compared to curves with two niy
could be brought together at twop q
not TO coincide throughout, 50 thatiff e,
pensatiOn at the extremes OF tenrg]
correct, the mean must be in efg l..
rerSd. II
The old compensation was, SPEAK. O
ly, in brazing a band Of brass On Or, of
process both theoretically and na :
erroneous, since the contraction an 2,
sion can only 90 on with a certaint Il
disrupture OF the elements and cOry a
equality OF the action. The new a 8
ceedS ON an entirely different arIans -
the compensating metals. The nn /"
steel, is cut neaIly through at The ,F'
Jremities OF the semi circles ty Ia
saw-tooth shaped notcheS, the lu as
termined by experiment, and The Z
forced into these notehes. The Oa :
ing weights are then put on at d. Y,
eXtremities of the semi-circleS insl al
ing distributed along them empIriaJ,
isiOuEd possible in this arrangement ii
tribute the compensation and COus !,
weights as to give at Will c6mpel& 4
the mean temperature, either 10 eIeS
less than the extremes, and Of eOuIa b
a compensation which shall eOincide h
out, which makes it theoretically ls
give absolute compensation iNaLa
lures at once. 1t is difficult 70
clear, without diagrams showing po
curves attained by experiment; buihpC
of the result will be appreciated b rf
know the mechanism of the baG& s
simply the theoretical eliminatMdl y
from the compensated balance @a n
perature is concerned. PRACTICALLY
chanically there VIII always be @8 4,
the inherent imDerlection OF human =
ship; but it is believed that the meald y
equally the manual adjustmentreQlln PC
reduced to One-third OF that actuaII ,o
under the old form of balance, ButOl Z
how involved are the various impToIl 7
mechanism it may be noted that the Q
construction OF the new balance Wle
have been possible with the meehala
duced by the Waltham CompaDE t& i.
of which may be judged from thal q Z
crometer last produced and snow V
which measures the twenty-hyelh 1
part of an inch, and even indci.a
largely that it might be divide, ,l InN n
readily into hundred thousands ! !
cromcter screw gauge detects lnt9- !, =
the thread of a screw up to hul-1 %
sandths, and a screw made loF Ut
ment Scientific Commission 10 "
measures has been constructed Il'
.,..,,.,, ,,f o,.,.,,. IN tho thread isleSf