The sun., 1893-10-01


IL appears that the experiments for some
time past made in France for obtaining a sat
isfsctory method Of color printing on leather
have been so far successful as to open up
prospect Of q new and attractive industry.
The method. as thus perfected. and which is
described in its essential details In the coll
umns OF L'Ipd,sirie Textile. 10 easily practica-
BILE The skins must be free from grease.
and II they have been prepared with tannin
are first stepped In n preparation OF sumac.
The application Of the color can be accom.
several cGiofs can BE- done ns,S Sy dyeing ths
parts. so that the natural color Of the leather
appears. or printing with a reserve composed
one Of bornS and one OF copal varnish. these
Ingredients all OF course OF the purest quality
The castor oil may be replaced By any mineral
| or vegetable oil
| The recent successful test as announced. Of
a small copper model gun. tempered by the
| process invented by Allard OF Quebec. has at
| tracted considerable attention. Before firing
the gun was carefully Rauged at two different
points. one and two inches from the breech
end OF the powder chamber. In the first ex-
pertinent the gun was charged with three
der. and waided with a plug, Of paper
driven well home with a mallet Alter
saased at The above: mentionedr points. and
the diametors were UNCHANGED; The next test
sety Of seTs ops powder being
only sufficient room for plug OF paper which.
SsGr was driven hsrS hS9 tfS
| Bickford fuse. and subsequent examination
OF the gun showed no flaw or perceptible ex-
pansion.
| new London steam plant has been con-
| structed Of a character SO largely automatic
| In its various m mechansms as to appear almost
! Independent OF human attention This 10
particularly marked in the case OF the huge
| boilers. in the management OF which. so long
tie I'll ' automatic ] stokers keep steadily At their
| work feeding the furnaces. and the steam
blast keeps the Gres roaring: As however.
| til 3 indicator on the pressure gauge creeps up
toward the 100 pounds, a driving belt begins
| to slide off one wheel on to another. and pre-
Blast is A shut M off, the stoRers stop dead and the
| fires begin to die down: then the driving band
the steam blast is turned on and tho fires be,
| gin 10 he fed again the vast and magnificent
the senre T4ee Of the II nnSns
volving with the utmost possible steadlness
and regularity The self Sharattbe. re- *
! typical wonders OF modern machinery.
| According to correspondent OF the " Photo
graphisches Archlv.." the desideratum OF print
lied to such degree as to insure a genuine
artistic result. and this by a process both sim
pie and economical. In carrying out this
method. an unpublished plate Of marble Is care
fully coated with solution consisting
Of Ave hundred parts benzine. five hun
dred parts spirits Of turpentine. fifty parts OF as
phaltum, ana five parts OF pure wax; when
dry it is exposed under a negative. which will
take in sunshine. about twenty minutes. After
developing with spirits Of turpentine or ben
zine and washing In plenty of water. the plate
IS covered where it is intended to be lett white
is in Immersed me in any dye which is soluble in
water: after a certain time has elapsed anc
when sullicien5 quantity OF the coloring mat
ter is found to have entered the pores OF tho
stone. 1t is taken out and polished. the product
being very satisfactory.
A more effective extraction OF iron from the
gangues. ore. or sponges in which it exists. is
now effected by means OF q contrjvance con-
sisting. as briefly described. OF an endless belt
or band having along its surface a series OF
conducting strips. and by means OF series OF
rollers above and below the band 1t is made to
assume an undulating. corrugated or SER
pentine, form: this band is placed in
dropped upon it travel naturally, upon an
inclined corrugated plane means being also
rent. Upon this corrugated band the ores or
through tho conducting strips. crossing the
same. causes the particles Of Iron on the band
to attach themselves elves to the ,. CONDUCTING strips;
directed upon the band which. being inclined.
flows in the direction opposite to that in
wardly he gold or copper or other metal com.
posing the Gangue or sponge which does not
' tiow backward ard until washed of Of the lower
end Of the band into receptacle placed there
adhere er to e the strips and travei With them to
the other ond Of the apparatus. when the cir:
ent passing thronGh , II the strirs is 6rSken and
improvements have been made in the purin-
cation OF lead and the recovery OF silver from
argentiierous lead. which result in the pro-
duction Of chlorine-a gas which can be most
advantageously employed in chemical manu-
features, The operation 10 said to be very
simple: that is. the chlorides Of calcium and
magnesium are decomposed with lead nitrate.
and the lead chloride 30 formed Is utilized for
the electrolytic production OF chlorine. while
s4s the o, qests Of hs Which
heated for the recovery of nitric acid. which
Is used for dissolylng fresh quantities Of crude
other metals. it is found may be precipitated
from this solution by the addition OF spongy
above proceeding. clectroyzed in a glazed
earthenware or enameed iron vessel Kept at
hs op and is With eei ppe or
tie lead & chloride. ehlSrne no ne outlet pipe and
lead. The carbon lectrodes-alter ternately an
odes. and cathodes,are securely fastened to
tie lidi Or TIE carbon n5 ,a plates may be all an
The largest locomotive ever built in England
an honor belonging to the Messrs. Hawthorn
OF fNewcnstle-runs upon a four W heeled lead
ing bogie and two pairs Of independent driving
wheels Of seven feet six inches diameter, and
there are four high pressure cylinders. Two
tna Id
are seventeen by twenty-five inches. and
actuate the first pair OF driving wheels two
outside cylinders are placed behind the bogie
wheels-they are sixteen and one-half by twen-
ty-four inches, and work the second or trail
inE pair Of driving wheels: tho total tractivs
forrn ayartal by tho f0ur cvlindara npnn tbo n