The Baltimore County union. [volume] (Towsontown, Md.) 1865-1909, 1904-10-01

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Casting Cold Metals-A Disease Of Poor
LivIng-Rivers as Fences-Radium in
ACKNOWLEDGEMENTS Motion 81 LAST
Annual Rings OF b1snes-kooo-Coioreo
5uk-Lin fnosograpns--no
%urs'e x@'l'-1 ll.-.1s
In his st,dfes of the effect of compression on
arelv-d;vgded rnesals prof. Hof. Of Witten.
Westphalia. has taken turniurs Of steel. copper,
ana bronzas. and placed half 4 pound Of each in
furn II : steeI cylinder Of two inches bore
--,a,,.,1w s,c~.ss5v,,- Shs ,,-..s,,ra tr s1 tons
with 4 pressure Of ten tons the structure Of
the turnines could still be seen. The final pres
sure Of 30 tons, however, gave perfectly
homogeneous block, and this could be moulded
80 nicely as to be ready for nickeling without
result Is the suggestion that turnlngs may Dc
compressed into many objects more dense and
satisfactory than ordinary castings.
"a
Leprosy has been investigated by Jonathan
Hutchinson. the great English pathologist, in all
parts OF the globe where 1t prevails. He finds
nothing to justify the ie5a Of contagion, as at
tendants IN leper hospitals do rot contract the
disease, nothing like an epidemic Is ever known,
and even transmission from husband to wife is
rare. He attributes the disease to decayed or
badly cured fish mot to any excessive use of
fish in good condition. s4ss -
zail III qskss3 81
Rivers seem to have played q considerable
part IN limiting the distribution of animals. A
notable instance of many noted by W. L. Dis
a rabbIt-like rodent OF South America which is
abundant south Of the Uruguay. but Is I'M
known to the north, whore the country seems
quite as web adapted to its habits.
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Radium promises to I'LL aneed Of Paris munich
pal laboratory. MEASUREMENT Of the electrici-
Gives fronfie l5y freezine IN winter Init 1aiium
offers means Of measurement, uuafFeoted NV
cold. izt sfl l0
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The radium clock of Harrison Martindaie.
English physicist. practically rIves perpetual
motion through the dissipation OF neraffvelv-
charged rays. A small quantity of radium sup
ported in an exhausted glass vessel by a quartz
rod is plneed in small tube, TO the lower end
Of which is attached an electroscope of two
long stripes of silver The activity of the ra-
dunn causes an electric current minus beta rays
to be transmitted to the silver strips, which ex-
pand until they touch the sides of the vessel
when earthed conducting wires instantly dis
charge them and they fall together. This is re-
beats OF that duration, and theoretically the ac-
ton viii continue until exhaustion Of the ra-
dium-in this case computed to be 10000 years
IN the future
80
new theory Is that the age Of fishes of the
COD family can be determined from the periodic
groWths of scales. Such growths arc known to
be annual in the carp, and 1t is therefore proba-
bic that the same Is true for saltwater fishes.
The view is confirmed by observations on va
rlous Gods by Mr.. j. s. Thomson, British biol
ogist. Annual rings seem to be traceable, Civ
ing the ages, and 1t is proposed to test the
truth Of the theory by returning labelled fishes
70 Inc seA hor future observation after first re-
corning tne present CONDITION OF their scales.
s.A
experiments IN ooioring six by feeding dyes
@ .ne siikworms date back sixty years or more.
cocoons resulted from feeding indigo and mad
DER, and many other coloring matters have been
tried since-mostiy with unsatisfactory results.
Aare attempts Dy U. De Labonnefon and others
prove that this method OF coloring silk Is quite
possiDie' perhaps even commercially practical
Die, though not with all colors or with all Kinds
OF worms.
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The Ambidextral Culture Society of England
seeks to Increase the ability to use the left
hand, but without aiming to add to production
in the arts by the simultaneous use of both
hands.
aSa
Considerable artistic advantages are claimed
for photolinol, the new Photographic material.
This is linen which has been saturated with
sensitizing solution, and on development it
yields Photographic image that shows on both
sides. The picture appears as If woven into
material, the double image giving stereoscopic
enect OF relief. BY reflected light the more
RI Mspnsa kQf5.Qn on the snfAt 81 the e 4Hg
fainter image on the back is brought out and re-
inforces that on the face. When colored. the
eifect is that Of solid oil painting BY reflected
light and of a colored transparency by trans
mitted light.