The Carbon advocate. [volume] (Lehighton, Pa.) 1872-1924, 1880-05-08
Compiled for the CARBoN ADVOCATE.
POPULAR SUI ENCE NOTES.

useu III IndhluS CbnS III Wnlcn 10 pTSSeTNc
fruits, jellies, vegetables, ETC., to be eaten by
the human family. Lead i we'll known
poison. and TO take it into the stomach even
in small quantities, is exceedingly danger
Gus, To detect lead in tin, rub your hand
hard and briskly over it. If your hand Is
Llackened, lead predominatcs. Good tin
will blaclen the hand very little. Good
tin also has bright appearance while the
adulterated has dull blue look. Fruits
containing acids, put up in these lead cans
will corrode and partake Of the poison, and
the person eating such fruit will certainly
do 50 at the hazard, at least of his health if
not his life. Manufacturers palm off this
bogus tin on the public because lead is cheap
er than tin-and by its use their profits are
greatly increased. Some legislation is GER
tainly necessary and should be instituted at
an early day to put a stop to this Wholesale
poisoning.
The omnibus lines of Paris have adopt
ed the new invention for subduing savage
or resive horses by electricity. The machine
is simple, and consists of an electric apara-
tus which is placed under the seat of the
driver A conducting wire running through
the reins connects the apparatus with the bit
Should the animal become unmanagabe or
| fractions, small crank attached to the bat
terry is turned, when current is formed
which effects the horses mouth causing him
to stop at once. The widest and most Grac-
tious horse is said to be subdued in this
manner,
BY means Of system Of irrigation it is
ascertained that the Algerian Sahara, here
| tof,'e aud still barren dasert,is susceptible
Of being made a mos; fertile region. The
| ground thus prepared has been found to pro-
duce wonderful results and under its opera
ton a soil has been constituted in which the
lnter-tropical plants grow with great vgor.
So enthusiastic are those engaged in expert.
mcntng that a writer asserts that, "hence.
forth it will be safe to say that the trans
formation of the Sahara into fertile region
is only a question of time, labor, artesian
wells, means of ofcommunication,a and society"
Scientists who have been experimenting
with fish and other animal life to be found
on the deep sea bottom say that the entire
absence of sunlight at greatdepths in the sea
has tho same effect as the darkness of caves,
in reducing to rudimentary condition the
eyes Of such OF their inhabitants as ordipari-
y enjoy visonal power. The most of these
fish and crustacea are provided with enor-
nous long and delicate feelers or hairs,with
which they feel their way about, as blind
man does with his stick.
Wabash, Indiana, claims to be the first
towrtto adopt the electric light for general
illumination. From the flag staff on the
court house are suspended -four Brush lamps
of 5000 candle power each, which are sup.
Piled with electricity by a seven horse pow
er generator. The test of this new method
of lighting the town was first made on the
Slst day of last month and has proved to be
very satisfactory.
The Audiphono and the Dentaphone
instruments for aiding the hearing of the
deal, have been superseded by more re.
cent invention called the 0steophone which
it is said is superior in many respects tc
either of the former. Dr. Charles II. Thorn
as, of Philadelphia, is the inventor Of thi:
new instrument.
The great gas well at Murrayville, Pa.
was recently tested and the stream of ga:
found to indicate pressure of $50 pound:
| per square inch ,as shown 10y steam guagc
One of the latest electrical inventions
is the electrical Polyscope," said to be a
simple and ingenious Gparatus for giving
| light in the cavities of the human body, as
the mouth, nose, ear and open wounds.
Since there are so many copying pro-
ecsses being invented these days,and as there
seems TO be mania for duplicating and
multiplying letters, circulars, etc, we feel
like giving our readers the benefit of all we
can learn on the subject. Hence we give
herewith the art Of Zucography, a simple
and easy mode Of printing, by which mode
any number of copies of letter, drawing or
circular may be produced. Our authority
is Prof. Thomas Bolas, F. C. S., who recent
[ ly read q paper before the London Society OF
Arts, describing this process in the following
manner; Zincogrophy, he said, is similar
to lithography, except that zinc plate is
used in the place Of the lithographic stone.
The so-called transfer paper is merely a
moderately fine paper which has been brush
ed over on one side with a mucila,'unus
mixture prepared hy boiling together l,Ou0
! parts 'i water, 100 Of starch, uf gamloga
aud oI glue. This paper is written upon
. with The ordinary Commercial iUhogaupf,
. writing ink, which ha, been rubbed up with
water like an ARTISTS water color The
/ writing being dry, II lsu,cys.lry 10 mois,eu
the back oi the transfer 10y means Of a damp
spongc, after which IL is laid face down
ward ON sheet Of ordinary roofing zinc
which has been previously cleaned by
means Of emery cloth. Both being now
passed together under the roller Of q small
press, the transfer udhcrcs to the metal
patei but on dampeniug the blcl, of III,
paper it becomes easily removable, leaving
the writing on the zinc. The face Of the
zine plate is now gently rubbed over with
mueilage Of gum anbec, which is all the
better for being sour, and the excess of gum
having been sponged of, an India rubber
linking roller, charged with ordinary print,
ers' ink, is passed over the still damp zinc
plate few times. The ink takes only on
the lines of the transferred writing, and il
is now merely necessary to lay sheet o
white paper on the plate aud to pass both
through the press to obtain an impression
an exact reproduction of the original writ.
ing. Any number of copies eau be printed
by repeating the operations of dampeninl
and mixing. Typography, thus simplifed
is rapid, economical and within the reach
Of every oue