The New York herald., 1851-08-29
N.72' W. ton NV s.4s' W. to AZ
COB. g. 5s' IS y54"75 5,5e' os


Average of s obs. s. 81" 55o"o3
These results do not confirm the suggestion that
there is greater less than the uniform theore tica
veloclIy vi rotation Of the plane OF oscillation ia
different parts OF its orbit.
soon after tue newspaper accounts Of the expert.
ment ut the Pantheon reached this country, tried
an experiment suggested by writer in the LDnfoH
Musuam NacS-that Of suspendiDg horizontal
bar. 1t was the view VI the writer that the bar
would rotate the plane of oscillation rotstes.
| suspen led a copper bar six inches lolg, in n
glass receiver, by slender iron wire, terminating in
u poiut the polished face vi a straight agnet.
by ADDITIONS to the weight of tae bar, reduced the
friction Oh the magnet to the least measure. Ine
receiver stood upon a window sill, in a brick build
ing, ana the bar having come to rest, IL con 1ued
at rest through forty-eight hours
At later period, 1 suspended glass tube in
the monument, from q height of 100 ieet-tgO feet
long, laden with lead at each end Tne frs sixty
feet of suspension Of elk braid, 20 reduce toe
toisiOn to minimum, then came iron wlre to
within ies feet of the bar, and the a brass wire.
60 sensitive the bar that found &c impossible,
so long as remained near it, to bring ~ to rest,
the unavoidable Currents VI air frVn my breath
beirg sutii cent to prevent Its becoming stall. J.,
however, reduced its oscillations to "a range vt four
or five inches at the extreme Of the bar, aud tnen
leit II over night. In the morning II was entirely
a. Tes;. 1hs was repeated under such fayOra ole
cTcJnstances, and with such coincdent results,
nduse ne 10 bshtve tcat those eXPvrmt Gters who
have noticed BAR or dsk, OF wAeel, 10 reyolve In
time COrTcspOnding with the plane OF oscillation,
have been rsled Dy some concealed source o. error
lrIta.ed the experiment ot permitting sAter to
flow dOm funnel, Ia the expectation that the re-
suiant Of the mott ,n toward the centre IN lowing
out, united vi b the possible rotation OF the body
OF vattr, aould give fise 20 the spiral move nent
with the sun, which is very gen,rahy believed.
tOOs, Tor this puT pOse. tub turned IN lathe,
ard caItfully bored half inch hole an the of
the bottom. Into thi, IA Die passed a good cork
from below. Having I'll, d the tub (Which contained
at.u Lite.n galioDs), the water was permitted TO
cone TO rest, as indicated by particles of sawdust
in the water and on Its surface. When quiet was
estatlishtd, which required nearly an hour, The
cork was withdrawn. The water flowed out win
the iUOeing results in seven srislsi-l two there
wac 10 whui in three, the wnirl just perceptible
in the last quart of ier was vito the sua IN the
remaining two, the whirl was In ihe opposite direc-
tion.
These results seem 10 indicate that in but two Of
the seven trials had the water obtained actua rest,
while IL had in three of the other instances snght
motion in one direction, and in two motion in the
opposite.
/ shvu ID rot omit to state, that the conveniences
for these observations have been furnished by the
Massachusetts, Charitable Mechanics Association,
who provided the necessary funds for the pendulum
appa' stus. The committee appointed by them,
consisting Of Messrs. WIgbtman aud Sim pson, OF
Boston, aid Mr.. Bond aud myself, Of Cam bridge,
were fa aststtd in all their abors by the officers OF
the bunkei's Hill MonrneDt Associs ton.
ON TnL rRorER MEASURE OF MECHANICAL FORGERY
Professor COFFIN, OF LAFAYETTE COLLEGE.
Professor COFFIN, of Lafayette College, read
paper on the proper measure Of mechanical f,Ece,
IA which he defended the com monty received
doctrine, that the force of moving body /, pro-
yoitoBal TO the prodact Of its mas INTO its Velocity
against different view which ke understood TO
have bsen maintained. by other members, at
previous meetings, viz that IL Is proportional to
the mass into the square Of she velocity.
lie Unmarked. that the question was an cid one,
bsyiig x been discussed, and as he had always sup
pos, d, settled by the philosophers Of Europe Ore
than century ago