Arizona republican. [volume] (Phoenix, Ariz.) 1890-1930, 1902-03-03
SCTENTIFI &c

About sound we have much TO learn.
Describing some late trials of fog
horns. Ford Rayleigh stated that those
having clliptical instead of circular
cones best spread the sound horizontal
ly when the long aNis-which was four
times the length OF the shorter-was
vertical. The anomaly of the silent
zone. on both sides Of which the sound
is heard, is still, q mystery. 1t has
been thought to be due 10 interference
between waves of sound reaching the
spot direct and those reflected by the
sea. but failure to recover the sound
By climbing Il tall mast. throws doubt
On the theory. One fog horn ct q sta
ton may be better than several, as two
or more sounds may tend to neutralize
one another.
! Air soundinSs of the last few years
nave given very unexpe cted tempera-
tIre results. The upper air is colder
than was supposed. the average being
about i3 degrees below zero. f. ~
10000 feet and 50 degrees below at
% 200 feet: and the decrease in temper
ature gains in rate instead of becom-
ing slower as the altitude increases
/ The fall of 3 degrees for each 1900 feet
in the lower strata becomes nearly
3
reached. The influanc eof seasons at
high attitudes is surprisingly great, and
st 10000 feet the average March tenn
perature is about S. degrees below zero.
While that CT August is only Il degrees
/ below.
! The chemical destruction OF weeds Is
advocated by learned French hortcul-
turists. One application of mineral
oil and water keeps down the grass in
walks fer two years. seas alt kills this
ties. and q spray Of sulph2te of iron is
effective against injurious plants OF all
kinds.
! Porcelain mandoIinc and Tiolins.
shaped exactly like the wooden ones.
are claimed to have greatly improved
! tones Their weight and liability "a
/ breakage are disadvantages.
Moving pictures of the electric arc
! have given RUNNER. a German expert
mcEter, some interesting results. IL
/ the are circuit We're placed an Undue
ZION coil and 2 microphone. with I
liquid interrupter to be used as desired:
and q slit in front of the horizontal arc
caused The image OF the two carbons
to fall upon the ground grass of the
kinematograph. The moving photo
graphic film recorded the steady arc "a
q bright continuous band. When thu
arc Missed the band became way. the
/ liquid interrupter cut il into rectangles
| Of varying lengths. and whistling
caused hundreds of vibrations to az
pear. Before talking into the arc. the
| image was reduced by a lens to a fine
roint uoon the film. which was moved
! ten feet q second. After the speech
photograph was taken, the film was
again passed through the camera. at
2 no nd no nil
/ thrown by the arc upon a sensitive sell
eniuh cell. The varying brightness az
the picture varied the electric resist
once of the selenium. so affecting the
current passin gthrough it tha two
/ telephone sin the circuit reproduced the
/ speech with surprising clearness.
Artificial hair has been difficult
matter to make Cocoanut and aeave
Gbres have beepn much used for stuff
ing furniture. and chemical theatnent
sclamad to make them impervious ia
vet, odorless. elactic unreliable ana
,r5reakable. But their short lengths
limit their use in fabrics. The success
OF silk from cellulose has led Seine
manufacturers at Frankfort on-tila-
Main to make further trials with the
same substance, and they seem ia have
produced not only a very satisfactory
imitation horse hair, but a very good
substitute for human hair for wigs.
/ Iirittleness of the cellulose, the trouble
some difficulty. IVES overcome by s3i1-
ming several threads together.
! Carbolic acid as a dressing for
wounds seems to be attended bT ris'-'
little understood. DR.. ]. C. Sheldon re-
! ports recent amputation of the Les.
made necessary by spilling weak car
bolic solution upon the foot and
/ Massachusetts physician, some years
ago, found records of more than 100
cases OF e,angrene due TO the free usa
OF carbolic acid. much diluted. for
slight wounds and bruises.
! In his ten years Of experiment at
Paris and Lille. DR.. Calnette has made
his antivenemous serum an effective
remedy for snake bites when injected
within four or FIVE hours: and it is now
supplied to such countries as India,
Australia and tropical South America.
where the victims number tens of
/ thousands yearly. The preparation of
this antidote requires the venom Of
many serperts. Cobras and others are
kept alive in a. special hot-house. and