THE MAGNETIC POLES.

The unwearied spirit of scientific research which so peculiarly marks the

times in which we live, has ascertained the positions of the northern and

southern magnetic poles to a degree of almost mathematical precision.

This discovery will be hailed with pleasure by every person at all

acquainted with the benefits derived to society by the labours of those

gifted individuals who have devoted their thoughts more particularly

to the study of this most abstruse and mysterious branch of physical

knowledge. The position of the northern magnetic pole was determined by

Sir John Ross, in his second northern expedition, fitted out at the sole

expense of a British merchant, to be in 70 degrees 5 minutes 17 seconds

north latitude, and 96 degrees 46 minutes 45 seconds west longitude,

near the western coast of the newly discovered tract named, after the

individual through whose munificence the boundaries of science have been

thus enlarged, Boothia Felix. Its place is now marked on the globes and

maps of the world published since the navigator’s announcement of the

solution of this long-sought-for problem. The day of the discovery was

the 1st of June 1831.

The position of the southern magnetic pole has not yet been ascertained

to so great a degree of precision. Excited by a noble spirit of emulation

caused by the success of the expedition fitted out by Mr Booth and led

by Sir John Ross, three expeditions have been fitted out to complete the

solution of the problem--to fix the position of the southern magnetic

pole, as that of the northern had been already fixed. The parties in

this noble rivalry are Great Britain, France, and the United States.

The British magnetic expedition, under Captain James Ross, sailed on

the 5th of May for Van Diemen’s Land. The only notices as yet received

of its progress are, that soundings were obtained at the depth of 3600

fathoms in the South Atlantic, about 900 miles S.S.W. of St Helena; and

again at the depth of 2680 fathoms, at 450 miles west of the Cape of

Good Hope. A dispatch from Captain Dumont d’Urville, commandant of the

French expedition, to the Minister of the Marine, details all the leading

particulars of his voyage, by which it appears that he has nearly though

not altogether succeeded in solving this part of the problem. On the 1st

of January the expedition sailed from Hobart Town in a southern direction

for 1350 miles, and in the latitude of 60 degrees south met with the

first island of ice, and shortly afterwards discovered land ranging

nearly along the south polar circle, and, as far as the navigator’s

observations went, between 136 degrees and 142 degrees east longitude.

The appearance was that of an ice-bound, barren coast, wholly unfit for

the habitation of man. The snow and ice which covered it gave its surface

an almost level appearance. Farther inward nothing was to be perceived

but ravines, inlets, and projections, without a trace of vegetation.

Whales, large porpoises, fur-seals, albatrosses, and petrels and penguins

of different species, were seen near the shore. The commander gave this

newly discovered coast the name of Terre Adelie. “This name,” he says in

his dispatch, “was intended to perpetuate the remembrance of my profound

gratitude for the devoted companion who has three times consented to

a long and painful separation, to enable me to achieve my projects of

foreign exploration.” On the 1st of February, in 65 degrees 20 minutes

south latitude, and 131 degrees east longitude, the expedition crossed

the meridian of no variation; and the magnetic observations afforded

the means of determining that the position of the magnetic pole must be

in the neighbouring land of Adelie itself, or on the compact ice which

adjoined it. Having so far succeeded in attaining the main object of his

mission, Captain Dumont bade a final adieu to these dreary regions, and

steered for Hobart Town, where he arrived on the 17th of February, after

an absence of forty-six days, having lost sight of the ice altogether in

the parallel of 57 degrees south latitude.

The American expedition, under Captain Wilkes, has been equally

successful in discovering the south polar island or continent, for

its geographical character has not yet been ascertained. The land was

first seen in 64 degrees 50 minutes south latitude, and 154 degrees 18

minutes east longitude, by a singular coincidence precisely on the same

day, 19th January, that it had been observed by the French navigator;

and Wilkes was enabled to run along the shore, for about 1700 miles, as

far as 97 degrees 45 minutes east longitude, so near the land as often

to find soundings with a few fathoms of line, and to be able to carry

away several valuable geological specimens of the rocks and soil. His

description of the appearance of the coast corresponds with that already

given.

Whether any immediate beneficial results, practically applicable to

the improvement of commerce and colonization, will accrue from these

discoveries, may be doubtful, but the experience of the era in which we

live forbids us to reject the prospect of ultimate benefits to society

from any discovery tending to enlarge the bounds of science, though

the means by which they are to be sought for are still out of sight.

The discovery of the extensive line of coast ranging nearly along the

south polar circle, serves in some degree to realize the conjectures

of former geographers, who, observing that by much the greater mass

of known land was in the northern hemisphere, laid down the position

that there must lie a countervailing quantity of land somewhere in the

southern hemisphere; so fully convinced were they of the existence of

this fancied continent, that in the maps constructed by Herman Moll and

other scientific artists of his time, the coast is laid down in a line

nearly corresponding in latitude with that of Terre Adelie, and continued

round the globe, so as to represent the whole of the south frigid zone

as a continent, on which they inscribe the name of Terra Australia

Incognita--the unknown southern region. With those who originated the

supposition, this unknown region was a mere creature of the imagination.

They were in possession of no facts to prove its reality; yet it is

singular that in this, as well as in many other fictions, the ideal

creature of the fancy has been discovered to have some foundation in the

realities of existence.

* * * * *

PAYING DOWN UPON THE NAIL.--The origin of this phrase is thus stated in

the Recollections of O’Keefe the dramatist:--“During the Limerick assizes

I saw a stuffed glove, about four feet long, hanging out from the top

of the Exchange, nearly across the main street; this was the accustomed

token that for a week or a fortnight, whilst the courts were sitting, no

debtor could be arrested. Debtor or creditor, this was a good thing for

the theatres, as during that time the city was thronged. An ample piazza

under the Exchange was a thoroughfare: in the centre stood a pillar about

four feet high, and upon it a circular plate of copper about three feet

in diameter; this was called _the nail_, and on it was paid the earnest

for any commercial bargains made, which was the origin of the saying,

‘Paid down upon the nail.’” Perhaps, however, the custom was common to

other ancient towns.

* * * * *

GENERAL USE OF TEA IN CHINA.--In China an ardent spirit is made from

rice, and called sam-shu, of which punch is made in a coffee-pot, and it

is drunk out of China cups; but the natives are not much addicted to its

use, a simple infusion of tea being the general beverage of all classes.

At all hours of the day the artisan, as he sits at work, has his little

tea-pot and miniature cup beside him, out of which he quaffs a little

at pleasure, or presents a cup to his visitor. The more refined class

make the infusion in cups, in the manner already described. After this

process, as nothing is allowed to go to waste in China, the tea-leaves

are collected, dried, and rolled up again, and sold to the English and

Americans, under the denomination of hyson mun-dun-go; that is, tea

having neither taste nor smell. None of this tea is sold in England under

its proper name, being for the most part mixed with other kinds, and thus

brought into the market. I never saw green tea used in the houses of the

natives, or of the Fanqui merchants, where of course the best kinds were

to be had. The fact is, the consumption of green tea is for the most

part confined to the lower orders and the opium smokers, who require

its stimulating effects to settle the disturbed state of their nervous

system; and with us it is found to correct the effects of an over-dose of

opium--_Dr Fulton’s Travelling Sketches._

* * * * *

PROGRESSION.--He that is good may hope to become better--he that is bad

may fear that he will become worse; for vice, virtue, and time, never

stand still.--_Colton._

* * * * *

“A great lie,” says the poet Crabbe, “is like a great fish on dry land;

it may fret and fling, and make a frightful bother, but it cannot hurt

you. You have only to keep still, and it will die of itself.”

Printed and Published every Saturday by GUNN and CAMERON, at

the Office of the General Advertiser, No. 6, Church Lane,

College Green, Dublin.--Agents:--R. GROOMBRIDGE, Panyer Alley,

Paternoster Row, London; SIMMS and DINHAM, Exchange Street,

Manchester; C. DAVIES, North John Street, Liverpool; J.

DRAKE, Birmingham; M. BINGHAM, Broad Street, Bristol; FRASER

and CRAWFORD, George Street, Edinburgh; and DAVID ROBERTSON,

Trongate, Glasgow.

The Irish Penny Journal, Vol. 1 No. 11, September 12, 1840 · 第 10 / 10 题