The farmer and mechanic., 1910-02-08


netc poles TO appear TO move froan
Last TO v est ana reyolve around the
poIeS OF the earth, and it Is tbs mo-
uon OF the earth that causes the star
>phefe 70 appear TO move These
are bolu assertions to make now.
astronomers attributed the motion or
the stars to be caused by the preces-
SION OF the equinoxes. When copper
nlcus advanced the theory that the
earth and not the sun rev ol> ed the
only proof he cou-d advance was the
simplicity OF the system and its con-
stquent probability. The motion of
the earth can never be made 4 matter
ol ocular demonstration. he proof
that / propose to make is based on
observations made at different tunes
and places upon the earth for the
last t. zee hundred years or more.
Anu first the agunic lnc. or nae of
no variation, was at London IN 1851,
alter Which the needle commenced TO
point westward, which it continued
to do until l 10. hen the western
declination attained it's maximum,
hiCh amounted to "a degrees and 40
minutes, and since then the needle
has been slowly travelling eastward.
London is 81 degrees and 80 minutes
north Of the equator (51 deg, 2S min.
ard 40 sec.), and consequently So d.
grees and so minutes (38 deg, so
Iilili ana ~ SeCJ SOutn OF lUe
Pole. then. taking "A degrees and 40
minutes as q tangent to the curve
(ciIcle) that the magnetic pole is
making around the North Pole. we
have a right angle triangle with all
the angles and one side given TO find
the side that will be the radius Of the
circle. And again Paris was on the
line OF no variation in 1868, and the
needle commenced to point west
ward, and attained it's maximum in
is17 Of % IL degrees. Then again,
assuming % IL degrees as tangent
to circle. whose center is the North
Pole, and knowing that Paris is AS
degrees and so minutes CAS- deg. so
min. and Ii Sec) north Of the EQua-
tor, and consequently Al degrees and
10 minutes (4l deg, min and 46
sec.) south Of the North Pole. we
again have a right angle triangle with
one side and all the angles
given to find the side re-
quired which will be the radius Of
/ of the circle required. Py the London
calculation measuring from the pole
of the earth to the magnetic poio
amounts to 15.07,10O de: rees; by the
| Paris calculation the amount Is
| 15.73-100 deg1 eeS. There should be
no discrepancy; but foi the presea,
| taking the mean, which is Is degrees
md 81 minutes, and this taken from
! 80 degrees equals "A degrees and 6
! n14nUltS. NOW, w ltil Is u8ccSSd1S III
order to find how long it will take the
earth to make the revolution and at
! the same time to prove that it does
make it, or that the magnetic pole
makes a revolution around the pole
! Of the earth? AS above stated. Lon
con or Greenwich WAS an agOnic
line in 1867, and this being zero point
| or the place from which longitude Is
| reckoned, then, we Will select for in
stance, New Perm, North Carolina, as
a place which is II degrees West Of
! London. The agonic line reached this
place (New Fern. n. c., in 1910, that
is, the ma netic pole had passed over
IT degrees in 1S3 years. and if it
passed over IT degrees in 1S3 years.
it will pass over $50 degrees Cor com
plate the circle) in S55 58 years. Or
to state it ~ rule Of proportion, it
would be thus: As II degrees is to 3it
degrees. 50 is 1S3 years to S55.5S
years or make a complete revolution.
/ C7:360. 123:S55.5S years.
In the above calculation New Bern
n c.. is merely selected for illustra-
ton. for after many calculations 1ol
different localities, it will be foun
that 85e years Is the time required 1or
a com plete revolution of the magn natic
| pole around the pole of the earth
| Put it must be remembered that
| Greenwich h will again be on an agonic
Inc in one-half that time, or in 42S
years, Wfi1cn VIII De IN a u lOS .
| That the sun and Garth are both ma g
| netic is now admitted by all scientific
men, and being magnetic must have
positive and negative poles But as
terrcstrial magnetism has been so full
~ explained by Gauss and others,
need not undertake to prove an ad-
mitted fact that the needle is govern
ed by the same magnetic law that gov
erns the sun and ear, h.
(Signed) ID. CT. McDUF'FIE.'
Fayetteville. n. c..
Ma Guthrie here gives defn tiOns
as to the compass, taken from the
American Encyclopedia, with notes as
to variations and then comes to his
conclusion in which he expresses the
wish that McDuffic was still alive al
his time when the eyes Of the Wor12
because of the Cook and Pears
claims. are turned to the North Poi
and of Pearys and Cooks claims O
reach hing the North Pole asks: 'Dll
they. or either of them, do it? If 50