New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1850-09-27

NE
onenine five feet wide, extending bsyond the "a
ni,h. The shutters to this opening are raIsed and
oIof red by meana OF endless chains working in tooth
ed pulleyt, and EARLY managed by wIoch and
piuions geared into wheels of one foot diameter
They sre perfectly weather. proof. 10 the loWer
edge Of the dome is affixed gr0oved iron ral, SIM
liar to the one laid on the granite cap OF the wals
Eig iron balls, whichhad been smoothly and truly
turned, were placed at equal distances round the
circle, and the dome gradually LEI down to restuPo
them. Although this dome liz estimated to weigh
about fourteen tuns get it can be turned through
whole revolution by angle individual, wlthoutany
very great exertion, in thirty tive seconds.
The central pier for the support of the telescops
s Of granite and is in the form of frusteum of q
cone twenty two feet in diameter at the base, and
ten feet at the top 1t ID forty feet high and rests
on wide foundation Of grouting composed OF n.y.
draulic cement and coarse gravel, twenty SIX feet
below the natural surface Of the ground and Is en-
tiEely detached from every other part OF the build,
ing. Upon the top of the pier is laid circular
cap atone ten feet in diameter and two feet thick;
which stands by three bearings, the granite olock
ten feet in hight to which the metallic bed-pase
Of the Instrument 10 firmly attached By bolss ana
screws, without any cement whatever. Five hun
red tuus Of granite were employed IN She con-
struoton of the entire pier.
Upon the east side of this tower is small wing
for the accommodation of the transit circle and
clock; and on the north aide is similar wing, de
signed for transit in the prime vertical The
| house for the accommodation Of the observer Is
connected with the east wing.
TIE "Gfaud Refracsor' was made by Messrs
Merz and Mailer Of Munich, Bavaria. They bound
themselves By contract to make two object gasses
of the clear spperture of fifteen inches, TO Do NJ
least equal 20 that furnished to the noble nent
! ncw mounted ct the Russian Observatory OF Palk-
ova. On being notified Of the completion OF these
! object glasses The agent OF the University, Mr..
Ctanch of London, accompanied by the instrument
er, Mr.. Sinms, proceeded to Munich and after
careful trial and examination, maze the required
aelection The selected object glass vas received
Mt Cambridge on the 4th Of December, 1886 the
great tube and its parAlaotic mounting did not ar
rive until the ! Ith OF June, 347 Ine process OF
erection WE commenced on the moroing OF the 23d
of June and on the evening Of the next day she
telescope was directed upon celestial objects. fhe
object glass of the telescope is fifteen inches IN dl'
ameter, and has % feet inches focal length, MAX
ing the entire length 20 feet English. There ara
eighteen different pOwerg, ranging from 100 TO
5000. The declinaon circle is 26 inchea In diane
ter, divided silver, and reads by four verners 10
four aeconds of arc. The hour circle is eighteen
inches in diameter, divided on Sver, reading by
two verniero to one second Of time, the movable
portion Of the Telescope and enhnery Ia estimated
TO weigh about three tuns. 1t is, however so well
counterpoised in every position OF the telescope,
end the effects Of friction go nearly obyased by
an INGENIOUS arrangement of rollers and balance
WEIGHTS that the observer can direct the lnatru.
lnent to any part OF the heavens by slight pres
sure of the hand upon the ends Of the balance rods
While observing, sldereal motion Is given to tue
telescope by clock work. regulated by centrifugal
halls. This Telescope cost S19,642
The optical cbaracterof this instrument has given
entire satisfaction The compone nts OF the star
Gan ma Corona, which Strive, with the Pukova
reiractor, pronounces most daNcuH to separate
being distant from each other less than half sec
ord. are eeen in the Cambridge telescope dlstlnct
"A 3ho 6erk than CLEARLY
defined. The same distinctnegs attends the sepa'
ration of GammRr Andromed@, the individuals OF
which are distinct from each other lesa than halt
second. The companion Of Anteres Estimated to
be OF tho tenth magnitude, and which was dsoov-
cred by Prof Mitchell with the Cincinnati rerao-
tor is quite conspicuous with power OF 700 1t
was with this instrument Mr.. Bond discovered the
eighth satellite of saturn, two days before 1t was
discovered by Mr.. Lassell of Liverpool, with ha
New tonian reflector of 81 inches aperture. Hehas
also made satisfactory micrometric measurements
of the satellite of Neptune, which ia not known 70
have been done with any other instruments except
Mr. Lsssells telescope and the Pnkova extractor
The mnutest double stars in the nelghborhooo OF
the ring nebula of Lyra, mentioned by Lord Rosse
az difficult objects with his 81 feet reflector, sre
seen in the Cambridge telescope. 1t has also par.
italy resolved the great nebua in Orion, ana
shows great number of starG within the limits OF
the nebula OF Andron eda
A transit circle, made by Simms Of London, has
reCeDtlY
| wing 1t has two circles, each OF feet diameter,
| graduated on silver to FIVE minutes, and reads to
single geconda by means Of eight microscopes &C.
mented to the granite piers-tour microscopes be-
longing to each circle. Che aperture OF the object
glass is II inches, with focal length OF feet.
The length of the axis between the shoulders OF the
pivota 10 feet inches. The pivoss are OF steel,
81 inches in diameter Two sets Of friction wheels,
supported by stong spiral springs relieve the pree-
sure OF the pivots the Ys. There are two differ
ent modes of illumnstion-o through the axis, as
usual, and the other through the eye-piece show.
ing bright wires on dark field. There are two
mcrometern attached TO the eye-piece for mea,ures
in altitude and in aZimuth. 4 single division of
the mcromster is equal to three tenths OF second.
There is also belonging to the observatory foe
comet seeker OF Il inches aperture, besides several
| ,b., instruments
0'T The win. on the north aide Of the tower is de-
;aaa5 h.reS.f,ar n receive tranat for she prime
vertical, but this irs, rumeht has not yet been
ordered.
Mr. Winism @. Bond ard his son, George P
Bond give their undivided attention TO the acts
Of the ohserv atofy. They do not propose to under
take q catalogue Of stars, nor the usual meriodnal
| observations which made at Greenwich aud
most Of the EuropeR al observatores; but they de,
sign 10 give their whole strength to that class of
observations for which their grand reractor affords
peculiar advantages The following are OF this
! kind: Observations OF new planets the satellites
! Of Saturn Uranus and Neptune double stars
| especially those which have considerable proper
motion; together with asenera raview of the most
remark bic nebus. They haverecenty Published
IN the Memoirs Of the American Academy de-,
lclipttn Of the great Nebula in Orion and that of
Aldromeda, accompanied with drawings of tbs
most cs!etu ard elaborate execution. II is pro-
posed to prosecute the study Of other nebula in
similar manner combining thsir attention to a few
objects and striving to produce perfect picture OF
every nebuls examined, 30 that future astronomers
may be able 10 decide whsthsr time has wrought
any changes in their constitution or figure. The
youDger Bond maintains constant and systematic
search fer comets. With the cometseeker he
sweeps over tie entire heavens at lesat once
month, and whenever he discovers any nebuous
I IL. L.. Z u