The Democratic press. [volume] (Ravenna, O. [Ohio]) 1868-1901, 1880-12-02
POPULAR SCIENCE,

The adulteration, of milk by starch
may be detected by this simple meth
cd: Add a few drops of acclic acid
to the suspected milk; boil the milk
and filter the whey. If the milk con-
tains the slightest trace of starch a
single drop of the iodine solution
will give blue tint to the whey. 4.
A new process for the manufacture
of armor plates, recently invented in
England, introduces steel into their
were made wholly of iron. 1t is
| the resistive power of the plates. The
| war ships of the present day are like
| ly to be clad with this new kind of
| armOr. fs.-. ''a 81 A'S''s 7''s' -
Herr Lewisohn of Stuttgard has IN =
vented a satisfactory method of taking
photographs Oh leather. A coating
of copal varnish is first applied to the
leather and allowed to dry we'll. A
second coating consisting of a!bunen
and white lead is then added, and
CT is given the desired sensitive sur
face by being introduced into the sill
ver bath. --... f--
: A cheap artificial, leather is pro-
duced by a German inventor who uses
for the purposea strong binding, wa
terproOt, flexible glue, in volatile
solution, which he impregnalcs by
heavy pressure, with flock of cottt,n,s
.oakun, finely ripped rags, scrapcd
leather, etc. He 80 spins and Weavcs
the fibre thus formed, or presses it in
iron, that he can make from it water
cloth Fictl olnn ronlno .0.nl
heels, book coverings and like articles.
A simple and interesting cxperi-
.nent in magnetism has been intro \
by Professor Thompson. a
thin plate Of hardened steel is written
upon with q magiletized iron style,
and the path trlversed by the style is.
thus nlaynetize.. In order to read
what haat been written, iron ii lings are
IL then placed III Il vertical position,
when, Of course, all tho filings fail off
except those which happen to fall OH
the part of the plate magnctized by |
the style, leaving the writing i'll IT,
lief. ....., -.
E. A military small-arm manufacturers |
at Wurzburg has invented a simple
apparatus which will enable any or
11AC VI gun
with central ignition to be uscu as a
saloon rifle, thus allowing men to be
exercised at target practice III the drill
shed, or even i'll their rooms. The iil-
ventiOn consists of tube of cast steel
OF the same length as the barrel of the
rifle with which it is to be used, but
Of very small caliber. This tube is
fitted with brass rings about an inch
wide, which enable it to be pushed
into and pulled out OF the barrel of u
rifle without in any ways injufing the
interior Of the piece. The cartridge
used is of steel ,and is SO designed that
none of the gas generated by the eX-
plOsion OF the small charge of deton-
lting substance used to prOpel the bull
ct can escape to injurc the bore of the
lilo. ..t So -sss..s as.f +.
Sponge underclothing is recent
lovelty invented and patented in Ber-.
in. 1t is claimed for it that it can be
leansed more easily than WOODEN {
,oods, and being more flexible, does Q
lot chafe the skin SO much. 1t is q
,ad conductor and tends to keep the
urface temperature uniform. One
Who wears this underclothing is not
ikely to take cold, for it absorbs the
'erspiration without checking it. =
\ After the mineral and vegetable inn y
urities in the sponges have been sdf-i ..
ciently beaten by a heavy hammer a
D admit of being readily washed out
he sponges arc dried, and pared with 2.
sharp knife. These parings are then
,wed together. The fabric is pre- P
pared without. any use of poisonous
yes, which, as Incorporated i'll cloth
sometimes proves very :
eleterious to the system.