The Sun.
London, England, 1859-06-20 00:00:00

ELECTRIC _LIGHT.

We stated a few days ago that an experimental
altatumsahyandobteebne
santreelectric
seencclr in Bearing
he PI ga
rhitsi n;ghence
uninteresting to explain to our readers- the nature
of such an apparatus. The principle on ,which it
is constructed is electro-magnetism ; that is the
property which electricity has, under certain cir-
cumstances, of producing magnetism, and con-
versely. Suppose a wire, many yards in length,
and clothed with silk, to be coiled round a hollow
cylinder, and let a magnetic bar of steel fit like a
core in the hollow ; then each time this core is in-
troduced into the cylinder, an electric current passes
through the wire ; though of short duration, its in-
tensity is proportional to the length of the coil.
Again, each time the core is taken out, another
electric current is produced in an inverse direction,
so that by constantly insertingUnd drawing out the
core, an indefinite number of electric current may
be obtained. if the core, instead of being a mag-
netic steel bar, consists of a bar of unmagnetised -
iron, an electric current be made to pass through
the coil of wire, then an equally singular effect is
obtained. The iron core becomes so highly mag-
netised that it will raise heavy bars of iron, and
the attraction is so great that it requires a strong
man to wrench the bar from the magnetised core.
This effect, however, ceases as soon as the electric
current is interrupted. It is clear from this, that it
is much easier to obtain a permanent effect
by magnetising and unmagnetising a bar in
this way, than by alternately inserting and
drawing out a steel magnet, as in the former
method ; and the only difficulty that remains
is to give the apparatus
.a convenient mechanical
arrangement. This is done as follows :—Suppose a
hexagonal frame placed horizontally on legs, like a
table. At each of the angles let there be one of the
electro-magnets, or cylinders of induction with wire
coiled round, as above described, and supported by
an inner frame, so that the whole may have the ap-
pearance of a horizontal wheel, with electro-
magnets for spokes; only the nave is supplied by
a hollow frame. In this hollow there fits a drum,
revolving on a vertical axis, and carrying on its cir-
cumference eight bars of soft iron, which., in going ;
•round, come very nearly in contact the electro-
magnets. Now, from what has been said, it is easy
to understand that, whenever one of these bars ap-
proaches an electro-magnet, it is attracted laterally
until it comes in front of it, when the action of the
electro-magnet ceases ; but at that instant the
attractive power of the next electro-magnet com-
mences, and so on. Now as each of the 'bars thus
receives six impulses in one revolution, and as there
are eight bars, the number of impulses received
in all by the revolving druni is forty-eight,.
which impulses occurring in a very few seconds,
produce in point of fact a continuous motion.
Now, if the place of the spokes be occupied, not by:
cylinders of induction, but by magnetised iron bars,,
the cylinders being fixed on the revolving drum,
and their hollows fitted with cores of unmagnetised
soft iron ; then, each time a cylinder comes in
front of a magnet, the soft iron becomes magnetised,
and generates a current in the coil, which ceases
as soon as the cylinder changes its place. Now,
as the motion is continuous, and the revolution
rapid, each ceasing current is replaced by
another, and so on ad infinitum. These cur-
rents are concentrated into a common conductor,
and, by this means, an amount of electri-
city is obtained which will melt an iron wire three
yards long and one-fourth of 0, line in diameter,
and perform greater wonders still, according to the
power of the apparatus. One consisting of 32
cylinders and 24 magnetS, and made to revolve
235 times in a minute, was seen to produce a per-
manent and regular light equal to 230 tapers.
Such, indeed, was the intensity of the light pro-
duced, that a lighted candle being held against a
white wall, not only the shadow of the candle, but
also the shadow of the flame was projected on the
wall by the electric light ! The cost at which
electric light of the intensity described might be
produced, would not exceed' 15 centimes per hour
for each apparatus.

POLICE INTELLIGENCE.-(THIS DAY.)

MARLBOROUGH-STREET.

CHARGE OF ROBBERZ AGAINST •A
POST-OFFICE
LETTER CARRIER.—RodBrick Rowe, 9, Avery-row, New
Bond-street, Post-office district letter carrier, 770, was
charged with stealing a quantity of wearing apparel the
property of a fellow-lodger.

From the evidence of Mr. Wm. Doble, tailor, landlord
of the house No. 9, Avery-row, thekriaoner had lodged
with him about two months, occupying a room with an-
other young man, and on Saturday afternoon the prisoner
being up in the room longer than he thought he ought to
be he watched him, and seeing him leave the house with a
bag well filled he stopped him -just as he got outside, and
on asking what he had got, he said some of the other young
man's clothes, and then perceiving that he was rather
bulky asked what he had got round his waist, and he then
found it was a pair of trowsers, which, with the articles in
the bag, belonged to a lodger named Callen. His reason
for suspecting him was, that he knew he was about to
leave the Post-office.

Francis Callen identified the articles, consisting of coats
and other articles, as his property. They were safe a few
hours previously.

In answer to Mr. Beadon, Mr. Doble said he believed the
prisoner was about to leave the post-office, because he had
not met what were called the "charge,.
The prisoner said he was about to leave because of bad
health. He had been drinking for four days or it would
not have happened.

Mr. Beadon said it was a very bad case—robbing a fel-
low lodger—and he should commit him for three months
with hard labour.

s
THE LATE MURDER AT W ALWORTH.J—WiIIiaM
Moore, the man charged with the murder of his wife in
Trafalgar-street, Walworth, about a month ago, for whose
apprehension a reward of £lOO was offered by Government,
was captured on Saturday evening at Notting-hill.

NEW GUN VESSELS FOR HER MAJESTY'S SER-
VICE. Mr. W. C. Miller, shipbuilder, Toxteth-dock,
Liverpool, has just received an order from Government to
construct two despatch gun vessels of upwards of 450 tons
burden. The following are the principal dimensions :
Length between perpendiculars, 14.5 feet , extreme breadth,
25 feet 4 inches; depth in hold, 13 feet.
At Novara, there are two large airy hospitals,
one civil and the other military. All the ladies of the
place, without exception of rank or position, have offered
their service to the surgeons as nurses, and their conduct
is stated to be admirable. They have been seen with white
aprons and tucked-up sleeves, comforting and relieving the
sufferers.

soPfa toct the Royal THE OVERLAND MAIL.--The heaviest overland
i wasconsisted
onede acrosses
mailtf ho
re
mail ever sent from this country
boxes for Australia, the size of the
naedChannelt
andsof rnco
China,
Saturday Doverand
night.t9oo Calais
trt
ia
former,
latter b
numeingtbhrer of boxeseetimes
sentthat oncetheofa
In 1854
about
4the
average
40 ; there is now a weekly overland mail and, compared
with 1854, the number of boxes despatched 9
on Saturday
night was equal to about 366 ordinarymail
overland boxes.
Although the French Government by the last Post-office
convention considerably reduced the rate charged for the
carriage of the overland mail from Calais to Marseilles, yet
from the increased number and weight of the mails now
sent the total income must be much greater at the reduced
than at the former high rate.
STRANGE CASE.—At the Liverpool Police-court,
on Saturday, Mr. J. B. Aspinall, barrister, applied for a
warrant or summons against
William Leslie, captain of the
ship Louisa Braginten, of Bideford, for an assault and
false imprisonment committed on Messrs. Manuelagittitle
Anjal and Custodio Gallo, members
of the
Legislature, and Guillenio Matta and Benjamini enna,
editors of the newspaper Aam blea Constztujenta, published
at Santiago• it appeared from the statement of /sPlimina,
that about the 9th December last a political disturbance
took place in and these persons, who belonged to the
party which was hostile to the Government, were appre-
hended in Santiago and thrust into prison, where they
were kept for some time as political offenders. They were
afterwards marched off to Valparaiso under a military
escort, which they reached on the night of the 9th March.
They were immediately put on board the above-named
vessel, which was bound for England, a Chilian man-of-
war steamer taking her out to sea for 10 or 15 miles. As
soon as they recovered from their surprise and sea-sickness,
they remonstrated with the captain on the illegality of his
conduct, and requested him to land them at some port on
the Peruvian coast. This, however, he refused to do, stat-
ing that he had contracted with the Chilian Government
for 3,000 dollars to take them to England, and deliver them
to the Chilian Consul at Liverpool, and that if he failed to
do so he would have to forfeit 1,500 dollars. The witness
and his companions offered to pay him 3,000 dollars, and
subsequently
the 1,500 in addition, if he would take them
back; but he declined to break his contract They were
landed in Liverpool on. Thursday night, and proceeded at
once to seek assistance in procuring redress. The magis..
trate (Mr. Mansfield) asked why Mr. Aspinall did not apply
superior court on such an important matter ? Mr.
to
a
Aspinall replied that the term was over, and the case Was
pressing. Mr. Mansfield said he recollected a similar case
in which the Marquis of Waterford carried off a returning-
officer from Ireland to Denmark on the eve of an election.
He would grant a summons for the appearance of Captain
Leslie on Tuesday (to-morrow).
The Belgian elections are terminated; and, ac-
cording to the Telegraphe of Brussels, they are on
the whole unfavourable to the Ministry and the
Liberal party.

The Madrid journals of the 13th are principally
occupied with the acquittal of M. Collantes, and
with the recognition of the Queen by the Infante
Don Sebastien. They regard the latter event as
a severe blow to the Carlist party. It has been
stated by telegraph that two of the co-accused of
M. Collantes, MM. Luque and Beratarrechea, were
acquitted with him ; as to the third, M. Maria
Mora, formerly Director of Public Works, who not
having presented himself, was tried by default, he
was declared guilty, and condemned to 20 years'
hard labour at the galleys, to perpetual privation.
of political rights and of the privilege. of occupying
public functions, to 40
years' suypolice, commencing on the expirai.oa of his 20
vt3lllance of the
i
years' hard labour, and lastly, to a fine of 20,000
of haw ig embezzled.
rettabls,wahnidchtohpeawyasbauckeustoetahe Trea.s, ury the 975,000
re