Daily Iowa State Democrat. [volume] (Davenport, Iowa) 1856-1859, 1857-02-14


,iensd to supeSsede the slow and unset.
,nti6c process Of cutting grooves in slsts
'osk to certain depth BY tn, common |
pick, and then taking Of the several lay
re Of qualification 70 form rooihog rec.
angular slstsh The machine 10 worked
by hand, and 10 90 constructed that the
cottsrs hsving worked . channel for
ward, il turns ct right angles. and outs
> transverse groove. The operation BE-
ing continued, cute out the four perfora-
lions With great rapidity; end perfectly
srue; the block 10 then taken out and
split into sheets, according to its lsmin-
ation. II 10 claimed that BY means Of
sbis mschine, one man can cut ~ much
slate in day, - twelve meo BY the old
pick system.
Smok elsss fsrusees are exciting much
atteetion 10 England, sod devices have
been brougt forward with . view to meet
that desideratum. Among these 10 an
ingenious construction BY Mr. Robt. II.
Bow, which docs away With the necessi-
~ for great regularity in the supply Of
The coal. 10 the furnace the drought
10 rsserved-shas 10, the lame, &c., pro-
coed downwards through and from the
Ere. The smoke liberated from the su-
perincumben,, coal 10, BY means OF the
suction Of the chimney, carried along
with Q due sdmixture OF cir, down
through tho burning fuel which
forms the lower stratum OF tho
fre-snd thus becomes intensely heated
and completely burnt. The combustion
10 very rapid. 10 come experiments made
with grsss Of Eve eigbts Of . square
foot 10 area, the combustion WAS ~ the
rate Of thirty pounds Of coal per square
foot Of crate per houf-ths height Of the
chimney being nearly thirsy.fivs feet.
The result 10 probably due to the self
clearing power Of tho furnace, and tho
comparatively dssss state Of the air when
it mingles with the fuel.
The celebrated Lancaster gun still
forms the subject Of extended desorip-
ton 10 the scientific journals. The gun
10 mounted on swivel, and can be point
Cd 10 any direction. The pillar on which
tho swivel rests 10 imbsdded 10 . solid
mass Of wood and iron, and the concus-
sion, 90 violent 10 the discharge OF ordi.
nsry guns, 10 by this plan Of mounting
90 diminished - to be scarcely percepti-
bic. The bore OF the gun Of 10 smooth,
bas the ball 10 elliptical. being something
like an egg with .he top cut of in ap-
pearsnce, which gives it greater velocity
and force. The principle Of the bore is
altogether . secret; bus experiment has
shown that these guns, With ten inches
and thirteen inches diameter, oammaod
. range Of seven thousand yards. The
weight Of shot they can throw averages
from sixty to ne hundred pounds. The
weight Of tho ten inch gun, including
carriage and appointments, 10 twelve
tons. The thirteen inch gun can discharge
egg shaped shells weighing upwards Of
two hundred pounds. The bore
OF tho gun OF course corresponds &c
the con,csl shape Of the balls; bus ths
principle Of construction is profount
secret.
An improved mode Of polishing glasl
has been invented by Mr.. P. Burgess, Of
New York. 10 polishing plate glass BY
the common method, cir 10 entirely ex
cluded between the GLASS to be polished
and the polishing surface; this causes q
pressure Of fifteen pounds on the squsr,
inch, on the back of the polisher, produ
ding 90 much unnecessary friction. Mr.
BE- improvement consists in GROWN,
the polishing bed, thus counterscting it
pressure 90 one side, az 10 the balanc
valves OF steam engines.
Machinery 10 now employed for edg
ing wall paper. The common method
as is we'll known, is by the tedi Gus pro
cess Of cutting the paper by 40 ordinar
pair Of shears,-which takes y ionge
time, and does sot cut the p PER wit
the requisite evenness. By the new ma
chine, the paper IL wound up on rollers
and a. it nurolls passeses under revolv
ing knives, which by an ingenious ar
ragement, cuts the paper any desire
width. These rollers are 90 arrange
that they can be shifted from one side
tho other OF the machine.
Daguerreotypes may be copied by th
electrotype process. Ia order to do thi,
q portion Of the back Of the dsguerroo
type 10 cleaned BY scraping it, or bv sp
applyi6g . single drop Of nitric soid
which 10 then to DO wiped of; . littl
chloride OF zino 10 now to b put on th
clean spot, and . small piece Of thi
pewter solder. A thickish copper wirl
haviug ono ends 6attsned, 10 now plac .
10 the fame OF csndle or lamp, and b
ing brought 10 contact With the picsur,
the heat 10 to b continued until the co.
der runs. The back OF the dseuerree
type 10 nov coated With wax, and the
placed 10 the bath to receive the depos
Of copper. The eleosrotype will be foun
easily sepsSabls from the pictures, 90
it should be slightly gilt, to prot OF fro
oxidation.
A New York inventor proposes . ne
mode OF constructing walls, which
sub.tantislly . revival Of the old Bah,
lonian method. The plan consists
NAMING brick walls, BY cementing Il
bricks together With asphaltum, bitums
and hydraulic cement. The bricks a
fret covered with the bitumen, which,
ito nature, 10 Plastic, fusible snd unit
With great too scity to calcareous earth
Tho bricks are then laid for tho col
struction Of tho wall being cemented Il
, gsther with the asphsltum and hydrau
10 cement. After the wall 10 thus +
completed, iss surfscs 10 then cover
over with melted ssphsltum, when
forms substantial wall.
A writer in the Scientific Aneris'
J suggests that some preparation Of hen
made up like pspier machs might
made efectusl - . substitute for "a
leather, . csmest Of India rubber mix
With other adhesive substances may
J employed to unite the 65rss togsthl
: Sole leather 10 6brous, - can bs witnl
sed BY tearing piece Of it lsngthwi.
Ito appearance when thus riven 10 Ii
that Of oakum fsleed.
{ 10 Gregory's Inorganic Chemistry
t y stated that there ere now sixsy-o
! simple substances elements. known
chemists, aud Of these fourteen cons'
tuts the great mass Of our earth and I
. atmosphere; the remainder occur only
small quantities, and come ere very raj
Aubin's portable Gss apparatus 10 COL
= ins into extensive uss. This invsnti
Z | nonaists NJ a afnva. LITE 1n0kin1 00nt1