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

koCiI<lN i iii
The Memorial of DR.. Sherwood. wbi,.h
we this day publish. must attract the uni
vcrsal attention Of tho scientific world. II
Will be seen that DIR. Sherwood claims TO
have made discoveries IN Magnetism, of
the greatest importance and utility, and
which, il found valid, must exalt him to an
elevation OF honor and renown, not inferior
to that assigned to Calico, Franklin or Full
ton.-ChriSfiun Statesman.
PUBLIC DOCUMENT.
Memorial o Henry HuH ShercocI, pravine.
The aid Of Congress to enuU M to per-
feet and secure the benefit fh.s inrcution
for determining Me rariution of the needic,
ard for .fmding The latitude amd iongitude
by The aid Of magnetism, Sc. June Is,
lo3S-Refcrrcd to the Committee on
Naval Affairs aud ordered to bc printed. J..
To the honorable the Senate and House
Of Representatives Of the U. States in Con-
grcss assembled:
Henry Hall Sherwood. Of the city and
State of New York, respectfully represents
That he is u native of the United States, aud
by profession Il physician: that he has long
been convinced that by The aid of ma.ne.
tlsn,, new aud better methods than those
now in use might be discovered for deter.
mining the variation of the needle, and for
finding the latitude and longitude, both by
sea and land: that, as the result of this con-
viction, lie for upwards of twenty years,
devoted all the Time which in his limited
circumstances was not necessarily spent in
The support of his family, to the investipa-
ton OF that science, and Of the nature and
properties of The magnet; that in these pur-
sulls.hc has made the following discoveries,
hitherto. rs he believes, unknown to man
kind; which will render magnetism an ex-
act science, and prove Of great practical i'm
por,ancc to mankind, viz.
]. lie has magnctiscd Il continuous iron
ring, as well as the circular iron plate; a
result hitherto regarded as impossible, and
the prncticability of which is denied in the
latest and best treatise on the subject: III
proof of which lie refers 10 the work ON
magnetism in the library for promoting use
JM kno"ledgr, by DIR. Roget, of London,
published in 1882.
:. lie finds that in the magnctiscd ring,
as well as in the masnclised iron plate. the
magnetic poles arc not in the axis of the
ring or plate. but al one point on tho left
and at another on the right Of the axis:
making each an angle of 23d. 2Sm with
The axis: the same angles which the polar
| circles make with the axis ofIhe earth.
8. lie finds that ihc magnciised ring or
| circular plate has two hcmisplcrcs, like
the earth; and magnetic equator; and a
magnetic axis, AT an angle of 23d. 2Sm.
with The axis of The ring; and line of no
variation, on which. as well as on The MAG.
nctlc equator, the needle lies parallel with
The axis OF ihc ring or plate; that on the
magnetic equator, the dipping needle is
horizontal; that on either side of the din
Is III proportion TO the distance from the
equator; and that at the magnetic poles i,
Is pcrpcndicular.
a. In the masnctiscd plate and bar, he
also iinds Tho Same law governing the place
oi the magnetic poles: us the magnetic axi.
connecting them makes an angle Of 23d 2S,u
with The axis Of the plate or bar.