The Wichita daily eagle. [volume] (Wichita, Kan.) 1890-1906, 1897-09-14
fain. stars. miscrome,ric and photo

fain. stars. miscrometric and photo
| metric observations OF faint satellites
| stars, and nebulae. variable stars a.
| times Of minimum brightness, and COM
cts long after perihelion passage. 60
Great focal length Oh IS nineteen times
| the aperture. instead &C the fifteen. ra:lo
used on the Dearbon refractory. giving
| large images in the principal focal plane
| OF the sun. planets, and planetary neb-
ulae. admirably suited for spect-oscopic
work. This renders i: desirable 20 pro-
| vide the observatory with labora tories
| equipped for the numerous researches OF
physical nature required for the full
| Interpretation % the phenomena studied.
and these, in turn, can be profiatably
| used 70 develop the work done with 9TH
er telescopes. Reflectors will be pr0mi-
nent among these. Professor Hale hav-
| ing long recognized the superiority o. the
reflector for stellar spec;roscopic work.
| A most excellent instrument OF this
class, Of twenty-tour inches aperture and
ony eight feet focus. constructed by Mr..
G. Willis Ritchey, formerly OF the Gin
cinnati observatory and later in charge
Of the wood working department OF the
secured and placed in position, and the
maker engaged 70 do other work fo- the
institution. Already a disk OF glass sixty
inches in diameter and eight inches
thick has been received at the observa-
tory from the plate glass works at 81.
Gobian, France, within the last few
days. II weighs nearly a ton. and the
tools required for grinding Il into shape
weigh several hundred pounds eacn.
The process OF grinding and polishing
this immense disk. under the immediate
supervision OF Mr.. Ritchey. Is expected
10 be one OF the most interesting feat
ures OF exhibition 70 be made 10 the
gathering OF leading astronomers who
have been invited from all parts OF the
world 20 be present at the formal dedl-
cation OF the observatory in the third
week of next month. The building to re-
ceive the monster instrument OF which
this piece OF glass, when duly silverei.
will be the mos: essential part is not yet
ere,ted. A tower 20 the northwest from
the main dome contains the twelve-inch
telescope which was formerly az the
Kenwood observatory in Chicago. origin
ally built as the private property OF Pro-
fessor Hale. Il has two detectives. the
visual one being employed in the usual
position for observations with the mi
crometer. while. when il Is desired -
transform the instrument into photo
Telegraph. the Photographic objective,
mounted in a snort tube. is attached TO
a side bracket az the upper end Of the
steel tube OF the telescope. A rotating
shutter, driven by an electric motor, IL
then clampei 10 a corresponding bracket
at the eye end. which also carries an
charging camera. The arrangements
provide for photographing and charging
the solar image and for work with the
spectrOheliograph the stellar spectre
graph Of the 40-inch telescope. a 10-lnch
objective grating. and several other
grating. prism, and direct vision spectre
scopes. The meridian room is not yet
occupied. except by small temporary
instrument. which has given the latitude
OF the observatory as approximately ~
degrees. "a minutes. Is seconds. (T1e
longitude is approximately hours, -
minutes. IL seconds from Greenwich
But the room is a big one and intended
10 receive a large meridian circle.
THE OBSERVATORY.
The helostant room will be one o. the
most important features OF the observa-
tory. The principal instrument in Il VIII
be constructed from designs now being
made by Professor waisworth. The in
s.rumsnt containing the Lenses Is fixed
ii position. the light OF the sun or other
object examined being thrown upon Il
from a mirror driven by clock-w0-k.
This obvfates The necessity OF a ponder
Gus mounting. such as has - be u
with telescopes OF the ordinary mode %
construction. The principle adopted u
that the mirror shall move - that i,s
normal snail always 5lsect the anz.e I.
subtended az the mirror b. the 0bje~,
and the telescope or other apparatus On f.
which :he image of The object is reflect +
The instrument viii b. used. among ota- I
81 things. in the prosecution q work i7ns ,
since undertaken by Professor Ha.e-
namely: tha mapping OF me solar corona /
w!taou; an eclipse. BY the aid o; a Ooio- /
meter. Sunlight xii be reflected from 4
The ae.lCE.8t mirror % a sllveTe5 con-
cave mirror y twenty-f0ur inches ape-s-
ure and sixty-7ne zee. focal length. The
mirror VII form an image q the sun
nearly seven incaes IN diameter n
large cast-l-5n drum TIE s1nIlga, VII
pass through TIE drum without ocuca-
.nz T.. ana fsii upon an an1puhsr. t5rm-
Ing an enlarged image Gqen a scrssn-
The 5oicnasts- WI be mounted IA - 8
"a sl1t Ia ne drum. which VII - r.
,z;ef b. an a=sss.zn: a. given signals
from :.s observer. Tho Vii Na:ch The
scale O. an extremely sensitive vecec--
.ny ga.vano1eter xlis telescope. Pr
fezs5- Hale says i = desired . de,e--
uie wa@-ae- any clfrersnces IN re heat
radiation q ne c1r5aa car y cs-z--e1
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