The Dallas daily herald. [volume] (Dallas, Tex.) 1873-1887, 1883-04-29

! he puts the opening Of trumpet into tn,
Ner and holds the point of the tube 10 hi,
ear he can perceive whether ships are moy
ing 8. remote distance. The same thips
occurs be has thrust the tube into m,
ground, Tor then, also, he will hear what i,
going on Il = away
Victor Joo n has observed that when is0,
parts lone Ell uiyalenO OF perchloride a
iron, and ~ par. OF CRY stalled oNalic acid
dissolved in a litel Of water, are exposed IN
the sunlight, carbon. Q acid gas is set free I'm
such quantity rs to supply the require
ments Of plants ineloSed IN the vessel with
II, the absorption aud decomposition OF
osrbonic acid by the plant beng. likewise q
photo chemical action, because II requires
sunlight to aid it.
Someof the English admirers Of PROBES sor
Jevons, who died just as he was about TO
carve for himself an enduring niche in the
temple OF fame, have begua 10 set up a me.
mortal TO him. The effort to establish a
chait OF political physiology in his memory
| IS worthy OF them, Is commendablein them
indeed, and grateful toward MIN who was
wise TO weigh and slow TO conclude. Cut
on suddenly, as he was, the world of
thought has had deep reason to mourn his
absence and to invoke the influence of his
spirit in scientific labor.
c. Wldemann communicates a new
method OF making an invisible ink 10 Die
Natur. To make the writing or the draw
ing appear which has been made upon the
paper with the ink, it is sufficient to dip 1t
INTO water. On drying, the traces disappear
again, and reappear by each succeeding i'm.
mersion. The ink is made by intimately
mixing linseed oil, part water OF ammo.
mia, 20 parts water loo parts. The mixture
must be agitated each time before the pen
is dipped into 1t, as a little of the oil may
separate and tioat on top, which would, of
course, leave an oily STAN upon the paper.
AT the Nuremberg exhibition was shown
novel use OF bricks of cork. These bricks
have only been used for building purposes
on account of their ightness and isolating
properties; but they are now also employed
as covering for boilers, and are said TO ex.
cel even asbestos IN preventing the radia-
on OF heat They are stated to be very
cheap, being prepared of small corks, refuse
and lsoating cement. AT Nuremberg the
application OF cork bricks was largely
shown, The usual size OF cork bricks is
10XilX2A inches.
Some time in 1868 salt deposits were dis.
covered near Middlesborough, England, at
deDth OF about | 200 feet. All attempts
TO make the salt an industrial success
failed NJ first. Now the efforts to bring il
to the surface are very profitable.
Wells are sunk down, and in
them two tubes are placed, one
within the other, so that an annuar space
is left between them. Into the circular
space water is poured. which dissolves the
salt, and the brine thus formed and subse-
quently pumped out yields about 100 tons
tons OF salt week when eyaporated.
new element has been invented by NJ,
Jablochkoil, the Ingenious inventor of the
electric lightin. system bearing his name
For the negative he employs carbon. but
for the positive plate he substitutes sodium.
AS an EXETER, air saturated with moisture
is sent by what he calls an aspirator into
the battery or cell, aud no calculated liquid
Is brought into play. The utility, SO to
speak, of the process is thus explained. The
soda dissolved falls to the bottom of the
box containing the elements, where it may
be collected and sold at profit, as without
taking consideration small quantity of
OF the carbonate and nitrate, il is practically
pure. Tests give the eectromotiye force as
four volts. This invention, If it is worth
anything, should not end here.