The Salt Lake tribune. [volume] (Salt Lake City, Utah) 1890-current, 1910-05-15

| Portable couch-chair TO reclinc In. He
watches tho changes In each detail of the
comets head and tall and makes sketches
upon paper: ~ first II appeared withou,
anF ttll AT the rear, and with only a
little halo projecting out In front. Then
| as the days went by the tall commenced
10 grow.
When Seen at It's Best.
Prof Hall had his computer make TOP
iae special table OF the comets changes
In hrllliancy, and some OF the figures
VIII interest those who would know when
they can get their beat view OF this re-
splendent body April IL was a mere
speck just barely visible, but by April
20 it had Increased to twice this bril-
,,iancF; py April IS TO over three times;
May = TO over four times: May 19 10
nearly ten Times. and May Is (last Fri
'any' 20 20 nearly sixteen times. while by
ne%t ,hirt, LdieSsday 1t viii have grown nearly
May II. fifty-one times. after which IL
VIII continue To grow DINNER again
80 you VIII see it at its brightest next
Saturday evening, The evening OF ths
day on which this article appears YOU
will not see it at all as IL will still be in
the morning twilight, az /, has been so
you In the evening sky until Frida,-.
when II will be TOO low and TOO much in
twilight for satisfactory view, and 1t
will set AN hour after the sun goes down
until more than two hours after sunset.
Unfortunately, when IL will be highest
and latest in the night sky, two weeks
from now: lis brillance will be less than
sixth OF what 1t will be next Saturday.
lntli April "a II was moving westward
through the sky. Then IT turned around
At point Just below the bright star In
Pegasus, and started back eastward the
direction in which IL Is now going. Sun
day. the day this article appears, II vill
be just above Pisces (the constellation
OF the fish. next Tuesday night IL will
be underneath Aries. Then It will pass
alons under Peiades and nearly across
Aldebarau until by the end 1t will have
gotten under Gemini and, on the 25th.
near to Cancer
Many people, are wondering how the
comet Will look when VIC pass through
fact it will be invisible to us on that
day. the same on which Its head is ex-
pected TO pass across the disk Of the
SIM The comet will be on the opposite
side OF the earth then. and its passing
will be visible-if seen at aIl-only In
eastern Asia and Japan. The passing
VIII take place In daylight there and
ing over the sun.
Measuring Effect on Earth.
II the tail grows as conspicuous as
anticipated, Mr., Charles G.. Abbott direc-
tor OF the United States astrophysical
obs<r,,a,ory obbserya,oTy Will from his new branch
measure the amount which the tail will
cut down the suns radia ton, while s
Is banging like great veil between Us
and our source OF heat This he will
do with a remarkable electric thermom-
eter. called the bolometer. which meas
ures, in millionths of degrees, the heat
which we receive from the vast solar
furnace. All Of this work OF the govern
ment scientists will be In cooperation
with the comet committee of the Astron-
omical and Astrophysical Society OF
America. whose chairman is Prof. C. c.
Comstock of the University of Wiscon-
sin. This committee has arranged a spe-
clal comet observatory In Honolulu and
the French government has another in
the distant Isle OF Tahiti. All around
the world there Is chain of cooperating
stations. from most OF which the comet
is being studied for the first time with
instruments which measure It's compost
ton and which will tell US whether ita
tail is gas or light rays. These instrl-
ments, called spectroscopes. were not in
existence when this heavenly wanderer
visited lis the last time, back In Andrew
Jackson's administration.
JOHN EBFRETH WATKINS.
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