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

arops II as fast as the earth reiso. I,
%oore ;n", Iiiat star, and so exact is the ad.
l.nn, lluSttnGnt in mat the stars Image can b,
hrPt III the center OF the eyepIcce T.
other words, the big tube Is f;nied e. 81, ~
low the stars 80 ''"ieu 10 ioi'
But the comet is a law unto itself an5
follow its Irregular path So Mr. pote-, m,.
aoes the ne%t best thing. He aims ~
9iescope @ at star next to the comet
enS eI,S Ipa Ppefhiaps zap shining through the tail
| Knows how fast the comet la movjne
away from the star at this particular timee
ana On, IN what direction: SO by twirlIne
telescope so that il Is aimed at the Comet
IL Is very delicate operation and one
demanding a sure hand.
loudly ticks seconds. but once IeT ever
minute you note that II hesitatcs and
skips tick. Mr. Peters listens for this
g;sp zap and and 1t Is a signal for him to correct
ways covered for TO let the telescope
aras would make blur upon the al :
There are two of these cameras and
With their tubes arranged side by side
they look like n pair of giant onora
glasses. boltcd to the telescopes barrel
in.}9 Tt9 .9rhins WITH it They have tubes
heavenly bodies have the same focus For
the same reason there Is no ground glass
t with his eve at the eye-piece OF tho
III
Telescope is aimed straight he knows
mat the twin cameras are focused upon
the same point. NF'i
The lenses OF the cameras arc civ
inches In diameter. and each focuses tho
comet back through a tube little over
a yard In length and having a square
T,a,nP atI his al @ tne rear, Into these clamps he
taining only one plate and therefore hav
ing but single slide,
The plates used are labeled "instantan
md t-s..
phers use Tor quick snapshot work such
as street scenes on rainy DAYS They are
lN5 inches In size Having put the load
60 plateIholders in the cameras and TAX
en- out the slides, Mr. Peters pulls a paIr
OF cords which open the shutters over
the lenses. The comets image then
commences to burn its impression upon
the plates, Nf'0"
Whizzes by Forty Miles a Second,
The comets speed past the lenses q,
.he m cameras Will increase TO forty miles
per second while some of these exposures
are pelng made. Imagine your snap
shooting an object moving past Won 2SSo
lImes Zines the speed OF a lightning express
Snt lnasmuch as this colossal skyrocket
Wili NIL not no a. approach nearer to the earth
than 12,Ooo,o00 miles, which is fifty times
as far as the moon. it's movement is moi
perceptible to the eve,
While the comet is seen in twilight as
now, the shutters OF cameras are left
open only ten minutes, while later on
when 1t appears against dark night
sky. half hour or more will be given.
The moon; which will intrude upon the
scene during part OF the comets period
OF greatest splendor. viii cut down the
exposure somewhat. This chief luminary
OF night will. however. be in the eastern.
or opposite. side Of the sky from that in
which the great tailed star Is seen.
The shutters having been closed and
the plate holder slides pushed back into
place, Mr.. Peters takes the plates TO n
small building near the camera house |
and develops them. Amateur photograph |
now means hair the popula-
ton-will be interested to rearn how he |
treats the plates In development.
Desiring delicate negatives full of de- |
tail, he uses a weak hydrokinone devel- |
oper, with plenty OF bromide, which holds |
back the sky fog due to twilight or moon
light.
Enlarges It Five Times.
Gradually the comets head and part OF |
the tail appear on the plate. and when |
the developing is over they show up about |
1--WE times as great as seen by the naked |
eye. The head, II is hoped, will show up |
on the plate about the size OF a pea when n |
il Is nearest earth.