Evening times-Republican. [volume] (Marshalltown, Iowa) 1890-1923, 1908-02-11
70 SEE EARTH MOVE
Demonstration to BE Made at
Columbia University to Prove
1t is Round
NEW CHAPEL WILL BE USED

Pendulum Ninety Feet Long Is to
Be Suspended From Dome of New
York Institution-Two Repetition
Planned Of FoucauIt's Noted Test.
If Koresh, the astronomer who star
tied the world a few years ago by an
nouncing that the earth is concave and
that we are living inside d sphere in
stead of outside. will go up to Go
lumbia university in New York Oh Fri
day, Feb. I. or Wednesday, Eeb. l.
he Will get first hand proof that The
earth Is round and that it revolvcs
around the sun. In these two days
Professor Harold Jacoby. head of the
department of astronomy at Columbia
and his assistant, DIR. $. A. Mitchell,
will reopen the famous experiment OF
F%oucault, the most ingenious of French
physicists, who In 1851 gave the frs;
actual evidence Of the earth's rotary
movement. says the New York Globe.
Most people" said DR.. Mitchell IN
| explaining the experiment, know d 4
the earth moves around the sun In.
stead Of the sun moving around the
earth. But If you ask ninety-nine per
sons out Of a hundred why this is sc
| they will be unable to. answer. To any
one seeing the ssln rise in the east
| move through the heavens and disap
pear in the west it would appear as
plausible with those phenomena alone
as a guide to believe that the sun
moves as to believe that the earth
does. In fact, you cannot make Chill.
dren or aborigines believe otherwise.
"In order that people may see actual
| evidence of the revolution Of the earth
we are going to repeat the experiment
devised and ..arformed by Foucault
more thar fifty years ago. We will
take st. Paws chapel, built for the uni.
yersity last ,'ear, and suspend from Its
cupola on 7, wire ninety-one feet long
a $50 pound unloaded she'll. so that It
is but a few inches above the floor.
"This is held out Of vertical by y
loose band. which is fixed by Il piece Of
string ten feet to one side of equilib-
rum. After the ball has been kept In
position for an hour, so that every.
thing, eyen the wire. will be absolute.
ly without any disturbing vibration. d
match Is touched to the string. This,
burning, releases the loose band. which,
dropping, lets the ball swing back and
forth like a pendulum In a straiaAt
line over a previously ruled straight
line on the floor.
"Attached to the bottom Of the ball
IS a brush wet with ink. AT each
swing this marks a circular piece OF
p placed beneath it. Although the
pendulum makes a straight line at each
swing, it will be observed that each
| line Is farther t o the right and that no
line crosses another except in the cen.
ter Of 1.-THE position of the ball II at
rest.
"In thirty-six hours this line, If the
pendulum could be kept swinging,
would form the radii of an entire cir
! Gle. At the north pole, where the re-
tation of the earth is faster, 1t would
| take only t~wenty-four hours.
THE reason for the phenomenon Is
| that the ball is suspended In space and
the building md the paper on its floor
are fixed in a definite spot on the
earth. The building twists around
! with the revolution Of the earth, while
the ball always swings in the same po-
sition. In time the floor makes a COM
plete circle around the pendulum.
"Foucault performed the experiment
for the first time at the Pantheon in
Paris with a pendulum 200 feet long.
But we hope to get as good results
with ninety-one feet"
Professor Jacoby when asked wheth.
er he had undertaken the experiment
to silence astronomers having absurd
theories about the earth's revolution
replied:
mo; we don't try particularly to re-
flute the theories of any crank. We
don't even expect to establish any new
law or record any new observation.
We merely want to demonstrate to the
university and to the public the proof
Of a well known principle.
1.-THE experiment has not been made
in the United States for years. Up
here at Columbia we have been handt-
capped heretofore by not having any
building with a roof high enough. But
with the erection of the new chapel
this difficulty has been met. and there
is no reason why we should not again
demonstrate the reliability Of Fou-
cault's evidence"
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In the Interior.
(Catholic Standard.o
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