, 1874-02-19

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Tho ball Is drawn aside towards tho north, md
sa {s in nas th' po'Sn lion Sae ny sssso fssa a9ea e
prevonts tho course Of tlo ball from
tito building. This throad IL burned aaunder,
alowing the bali t9 swing, ireo from anyy siio
loased from tho hand. Tho ball swings to s, and
tuen roturus nearly to the starting place but
ents TIC ring 1ittle t1 so tho eastward Of tho
t1' s"f shen little setuSs. ss ss Ts'' point #
oaHtwartl OF TINT touched ou its first return to
| tho nurth side Of tho ring. This deviation il
progrossisc, and amounts to about ono-thirtioth
part Of nm inch Ut each roturu. 1ts character is.
ton ia not 10 great as thoro shown. Tho
ball swings from to 81 $ too; a to b; to
q; to 9; eto +; ftoh;h h tok; to m; nj
to- p; ;dtl e no, to ooases to to a,n to =
Thore il, however, tendency in tho ball to de-
scribo n portion Of an elliptic curvo, alternating
OIL tho two sidcs Of tho contral point, Q, instead
| OF @ straight limo in tho plane Of the horizon.
IQ9 IEh6u4iH l1f LUIS 1Hct ATu eElapS 1LLl0 loo
abstrusoly mathematical for tho general reader.
LII ono llonr tlo deviation amounts to worry
nearly 10 inches Oh each sdo OF the ring, which
| is equal to an anEle Of 10 degrees minutes ut
! the contre, g. Tho pendulum seemH to turn
| round after the sun. fronl Gust, by south, TO
west; that being tho direction il which tho
| hullls Of watch move, with reforonco to au
| observer. and this tendency OF tho pendulum iH
80 persistent that it is not eyon altered by twist
iuE the wiro from above, which causes the ball
iudicatoa by the stripe Of paint on one! aido Of
| tho ball.
THE CAUSE OF THIS MOVEMENT.
Wo call explain this phenomenon in no other
way than by supposi1tg that tho apparent falling
buck Of tile bull on tue circle Is only relative.
Tho ball to.,ds to travel always iu the Hano
plane, and tho eartls surface moves undor it.
Tho principles OIL Which the experiment turns
wero onuuciatol by Sir 1saac Newton: that u
mass Of lnattor las no Inherent power to cllauge
it's condition, aud that action and reaction Aro
equal. Hence, whether ut rest or in mution u
| mass must always continue in tho same Btnto,
| unless tint state bo cll,nged by somo
Of to law E Tint Il the mass 81 matsor aouusio Sa IN
| motion it will continually move IN the same d.
.ectios, unless tho direction bn changed by some
exterior force. Now, il this be really law OF
matter, then 1t Is equally applicable to grain Of
i1sgly We find that it operates equally upon tho
bnIl OF loud ~ upon the whole MauB Ut our
carll, though tie Que contains " ittlo moro tllau
III, ooO, ooo uO2 ooo, ,ooo, ,o0o,ooo times MS much
| matter In tho other.
Tho mutual attraction botween tho Garth and
tne u"4l 10 sA1!shg" M glal3 WIEN tilo ostaico oe-
tMeeu luen1 10 tne ieast poseIbie. Il!la occurs
when tho suspending wire is perpendicular to
tho plano Of tho horizon. II tic ball bo drawn
OH ono side to tho diutnuco Of IL foot fro,n tIa
ncrpen}icu}nr ;t- III thon rhn,,t < i,,,ta,
! tfnrti,nr fro,,, H., ,,rt1, .ios aa"'3oa
tMtnoA ttoa1 'Me eA1'a tnan Wnon at
rolati9o lcsE. ucnce, ~Aon tho bAll il
~ .as aasa ~ .',e tne nurnng OF 1ho thread
~ " es o"a',;ro 49, ur1e .naI
!ul1 ~ uAo Acl1AA1Ga sCtuCltp HuICu WQulu carry