Edgefield advertiser. [volume] (Edgefield, S.C.) 1836-current, 1838-10-04

D. In every magnet, he finds that tho
| magnetic poles are not on tho outer edge o.
the ring, plate, or lar. but within the edge
and at The depression of2d. 35m.
u. By the magnetic ring, he has tiscoy.
cred the true laws of magnetic motion aut
influence, which have hitherto been un.
known, aud which arc now, bv the use o
the ring, aud Of the plate, clearly and casil;
demonstrated.
Z. By the aid of the magnetic ring, he
has discovered the precise position Of the
magnetic poles Of the earth, the existence ol
which has been known Cnr II considerable
time, although their true position has hi,h-
erto been the subject nf continual contro.
versy, and has not to- this day heen coniec.
tured by any writer on rnagnetism; and as
aScertalncd that the magnetic poles arc in
the polar circles. or 23d. 2Sm. from, the
poles Of the earth; aud that the maync tic
axis makes that angle with the axis of the
earth.
The position Of tho magnetic poles in he
polar circle Is also confirmed aud established
ny numberlcss calculations founded on this
fact. and furnishing results exactly true.
d. lie has discovered that the magnetic
poles OF the earth are not stationary, but re-
voIve in the polar circles; moving regularly
from cast To west round The poles of The
earth; and that the period Of their rcvolu-
tlon Is 66G years, wanting few seconds.
and that their annual motion is 32m. 3G.
l0. tie has discovered that the needle.
when on the magnetic equator, always lies
IN the plane of tho terrestrial meridian, or is
parallel with the axis of the earth,
IL tlc has discovered that what is cal
led me line Of no rar,aiion. is not n wind
I'm 81, ~.
drawn in the latest and best nautical charts.
but Il great circle of the earth, or magnetic
merriam, passing through The magnc tic
poles, as regular in its form and progress as
any other great circle of II,c earth
II. If series of magnetic mcridians he
imagined, passing through the magnetic
poles. he has discovered that the circle of no
variation is that magnetic meridian which
passes at the distance ofGd. 2Sm. from the
poles of the earth.
l3. He has found that the circle or no
variation, like the magnetic poles, is nor
stationary, hut revOves round the earth in
OOO years, aud 81. 26s. i'm one wear.
IA. lie has traced the circle of no varia
ton, and has found that halroi 1t which now
crosses the continent of America. aud which
n9% %ay be ts dea5nR hs ee ss
or the arctic line of no variation, on Septem-
Der l5lh, 1887, passed near, or through, the
following places. viz; Proceeding from the
north magnetic pole, i'm latitude 66d. 32m.
west longitude ODD. lGm O3s. Oh l-3. il
traversed Hudson's bay west of Mansfield
and Southampton islands; entered James
bay between Lake Muskinaw and Abbiti-
bic river; run through the Abbtiblc coun-
try: crossed the east part orihc Lake Mani
touin, proceeded lille west of Lake
Simcoe; passed about Id. west of Toronto:
crossed The western point Of Lake Ontario,
and The eastern point of Lake Erie, passed
about 3lm. west Of Fredonia, New York;
about Id. east of Pittsburgh; abou, I'd. 22m.
west of the City of Washington; about :S2m.
west Of Charlottesville, west Of Richmond
about 35m. about Id. BON. east of RALEIGH.
NC: about I'm. west of Wilmington. N. G.
passed through the Bahama islands, cut the
east end of Cuba, about Pm. west of the
town of Barac0a;cu cui The western peninsula
OF ST. Domingo. abont I'm. west of La
Vacha: crossed the Caribbean sea; entered
South America, about l0m. west o the ci-
ty of Maracaibo: intcrsccteh the equator in
Longitude 69dr 09n. passed west of Bue-
nos Avres. crossed the cast cape of Soldad,
and cut the antartic circle in l3d. O4m
west. The eastern or antarctic semi, circle
OF no rnriation lie has also traced in its
whole progress; hut from regard to brcvily
omits the description Of il here.
10. lie has asccrtained The exact angles
which the circle of no variation, as well ms
all the other magnetic mcridans, make with
the terrestrial meri'lians. in every degree,
minute, and second. of latitude and in eve
ry degree, minute, and second. oflongiude
nm m rlf md Io, I,
labor. constructed a series of'rabes, found
cd on the known principles of geometry
and irigonomctry, by which these angles
are easily asccrtaincd.
lG. lie has also discovered the precise
ang which the magnetic axis makes witt,
the geographical meridian, in each deoree.
minute. and second, of the globe; and has
constructed series of Tables, by which
these angles may be at once determined.
lie bcgs leave further to represent that
he has invented new instrument called
the GEoMETER, for which he has entered
the cavcat Tor patent, in the Patent OF
flee. and for which, al an expense Of ST. ,6OC
he more than month since, sent out 70,
patcnis to London and Paris. This instru.
ment consists partly of dipping needle
and partly of Twelve c0ncpntric moveable
circles marked respectively with degrees
minutes, and seconds, and with cores pond.
ing tabular degrees. minutes. and seconds
Its practical use may be easily understood
by any person unacqmainIcd with tho prin.
ciples on which the tables are construct ed
if he understands the four ground rules o
arithmetic. by means of this instrument
tho following important points may be casi
ly and certainly determined;
|. The plane of the magnetic parallel o
.:. l.