The Baltimore County union. [volume] (Towsontown, Md.) 1865-1909, 1907-09-14
oorrapopdMcs Baltimore County linton.
SCIENTIFIC MISCELLANY.

C0ffsep0B6slcs Baltimore County linton.
SCIENTIFIC MISCELLANY.
Dark Photography for Fancy Work-A
Meteorite Scar-A Great Veult-An
American Failing-Papered Iron-Alco-
ho1 in Bread-Enects Of Changing Diet
A Novel Messenger service-A Fire.
mans VEIL
=. new application of science to home industry
suegested by DR.. W. ]. Russell. Nine years
rt~. snis Investigation discovered that many
60 OF wood produce an invisible image on
a.. r.aees 10 the dark, and he has since shown
e.sS- nae actlon is exerted by flowers, leaves.
~ and bulbs-in fact by practically all
vegetable substances except starch. cellulose.
gum, sugar, pitch and pollen. The speci-
mems are first pressed between blotting paper.
then laid on the sensitive plate or paper for a
few hours or day. Pictures on sensitized satin
are adapted for variety Of fancy articles. and
Il is predicted that the making and use Of such
work win become very popular among the ladies.
The best results can be had by placing the speci-
men and sensitive material between thick felts
under pile Of books over night or until ready
70 develop. Dry specimens should be slightly
moistened. and action can be greatly increased
By first exposing the specimens to sunshine for
q few minutes.
A crater without volcanic rocks is among the
geological wonders of Arizona. Ten years ago
CIV. Gilbert supposed there had been at Coon
Butte kind of subterranean volcano, or explo-
sion Of steam, but the thousands Of masses Of
meteoric iron in the vicinity have since sugges-
ted that the crater cone Is the scar left by the
fall of an immense meteorfc. Excavations are
confirming this view. Meteoric fragments are
unearthed at depths Of 300 to 500 feet. and
NtQtal Of ten or eleven tons of the iron has been
col1eoteSA
The largest room without columns is said to
be in q solid concrete building Of the mosque at
lucknow. India. It is 1872 feet long, 81 wide. end
IS high. The timber mold was left ayear for
the concrete to set. and the building. 1S2 years
old, IL still unimpaired.
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The New York accident-preventione exposition
Of 1907 will be the first in America. An exhibi-
ton of this kind was held in Germany In 1889.
one in Amsterdam in 1898; and several others
have followed in Europe and Canada. A num-
Der of permanent museums have been devel- |
oped. One was established at Vienna in 1890;
one at Amsterdam in 1893; one at Munich in |
1900; one at Berlin in 1901 and even Russia has
lately opened one at Moscow. To show the |
value OF the instruction in saving life and limb
Il cited the fact that America has from two to |
nine times as many accidents among the same |
n6mDeF&f men in given trade as does Europe. |
-.
The protection of iron and steel structures |
against corrosion by moisture and atmospheric |
gases Is still one Of the serious problems Of the
engineer. In recent experiments by L. +. Bark
or, various paints proved ineffective, and he hit
upon the plan Of trying paper This was first
impregnated with paraffin wax. The iron being
then thoroughly cleaned and covered with
: sticky paint, the paper was closely pressed TO
the adherent surface, with the edges somewhat
overlapped. Thus protected. iron and steel
and even the sticky layer of paint-have re-
NAMED in perfect condition after an exposure
20 smoke for 81 months. Papered steel was also
exposed to moist air and sewer gases. and was
NOT attacked in any way.
Ass
Az -four undergoes fermentation In the pro-
cess of leayening, it has been supposed that
little alcohol might be retained in the loaf in
arfte Of the ovens heat. This proves to be the
caae one German CHEMIST having found upon
0s 70 "a of absolute alcohol in freshly baked
-HnesfSh bread. while another obtained mucn
amalier amount-O.05 to 0.06 per cent-from Ger
man wheat bread. Besides the ALCOHOL was
found a little dark brown oil, which had the
odor characteristic of new bread.
ass
The meat consumption In the British Isles in
creased from three pounds per person In lSoO 70
fifty pounds in 1900. DR.. D. @. Chalmers. OF
Edinburgh, points out that this remarkable
change in diet is having effect in the evolution
of disease. but notes as a singular fact that
there has been q material decrease in govt, al
though diseases often regarded as of equity orr
Gin have increased. He has studied the effects
IN vouur rats Of excessive eating of meat. He |
has found q delayed and imperfect development
of the bones and weakened condition whose
counterpart he has observed in young infant.
When the child was born the mother was being |
.nnnni -of nulnonary tuberculosis by raw meat
dsat- which had been continued eighteen months |
A. the are of year the child showed delayed |
dentition, became anaemic. was thought 10 nave
tuberculosis, and was fed with raw meat juice
for six weeks. Iterew worse and died. its SYM
toms perplexing the attending physician.
piece of it's bone verified DIR. Chalmers Suspicion
that its trouble was that of the meat-fed rats
erhaustion of the functions of the bone marrow,
thyroid gland, etc,-and showed that treatment
ahould have been diet correcting the excessive
use Of meat by the mother.
s's
Carrier pigeons are put to novel use IN tnin-
" settled district in the north OF Scotland. On
long rounds doctor takes several pigeons Win
him, and when prescription Is TO De nheo al
once he sends message to his surgery, where
an attendant prepares and forwards the medi-
cine. If patient is liable to need an extra CALL
q pigeon is left to send for the doctor.
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THE fireman's cheat veil'' lately tested at
Cologne is made from cane fiber. 1t Is soaked
in water before attaching to the ordinary brass
helmet, and the moisture is long retained, CIV
ing great protection against the heat of a fire.