OBSERVATORY. 
Trifh Obfervatories.—In Ireland two obfervatories have 
been eftablifh sie on a great fcale, the oneat Dublin, and the 
mas at Arm 
> obfervtory belonging to Trinity college, bbe 
aaa called the Dublin id rvatory, was be n the 
year 17 t was founded by Dr. Francis Andrews, 
provott of that coll lege, who beet a large income for 
this purpofe, which was to ol ag upon a particular con- 
tingency happening in his family. When this event had 
taken place, the poles with’ oe wonted zeal for the pro- 
motion of fcience, determined not to lofe time by waiting for 
the accumulation; but advanced from their own funds a fum 
oo) exceeding the amount of the original bequett. 
chofe for ther profeflor of aftronomy and o 
fee the Rev. Dr. Uther, a man of extenfive learning 
and indefatigable refearch, whe was directed to proceed to 
ingland, to order from Mr. Ramfden the beft inftruments 
he could make, without any limitation of expenfe, and it may 
be here noticed, that the pecutiar anxiety of this eminent artitt 
to execute the order in the greatett perfection, caufeda confi- 
derable delay. 
The apparatus firft ordered were, a tranfit’ inftrument of 
fix feet focal length with a four feet axis, bearing four 
inches and a les aperture, with three pile Sieg aol 
ing powers up to An entire circle of t diame- 
on a horizontal axis for meafuring meridian altitudes. 
re equatorial inftrument, with circles of fi iame- 
os 
locks were alfo 
tent ; and the foil is very favourable, i te a elereois fub- 
arkable for ab 
e plan of the building unites at cnce both eleganc 
a pean it fronts the eaft, and the lower range 
windows and doors are twenty thr e in ber t 
centre there is a 
iment of the dome is effected; fee our article Rotatory Roor. 
On each fide of the centre ead and joined to it, are 
two handfome edifices, of two ftories high, for the refidence of 
the profeffor, and is eee is attached a wing of oue ftory only, 
put terminated w re) ftorres. Thefe domes 
are intended for Sate ob/ervations, fuch as of eclipfes, 
occultations, ak comets. ‘The wings, however, are not yet 
complete y ni 
moft impor rtant erection belonging to this efta- 
broad, and twenty- 
aig = Portland ftone are erected for 
moft firm bafis, and the floor 
s to “et ail the pillars rife totally se 
rom it ; her Fach was Dr. Uther’s attention to extreme a 
curacy, that he firft afcertar ed the pillars to be eal 
homogeneous, left any variety in their fubltance might ad- 
8 
: and an achromatic telefcope, mounted on a polar axis, | 
mit of a difference in their expanfton or contraction by 
heat, cold, or other changes of atmofphere. The clocks 
are attached to pillars of the ener fteadinefs alfo: they 
were inade by Arnold, who exerted his beft {kill, ane 
are finifhed in a mafterly manner: the pallets are of rub 
and all the laft holes of the movement jewelled; the iter 
fion fprings are of gold, with Arnold’s own five barred 
pendulum, and cheeks capable of experimental adjuftment, 
fo as to make all vibrations ifochronal, whatever may be the 
excurtion of the sou 
a are the plans and apparatus of this {plendid efta- 
blifhm may now for a moment be permitted 
to aa our attention to the beauties of rae. which are 
as’s 
this aaa in parti 
ountains are diftinét] 
north- cal of Clontarf and its environs are the 
this ele) is not without its eae. th-welt 
we have the picturefque - ruins at Csiflenock, ty to the 
weft the e xtended a nd r ich view of Kildare, in which 
be fore the inrument had been all fupplied. s fuc- 
ceede 4 by tl ev. Dr. Brinkley, who had diftinguifhed 
himlelf at Conbelige by profound analytical inveftiga- 
tions, and who has fince greatly enriched the TranfaGions of 
the Royal Irifh Academy by mathematical and aftronomical 
communications. His laboursin pratical aftronomy, however, 
important rele are ected, peticoltl on aie 
aberration of light, ad 5 eon. He has been for fome 
time engaged in a feries of obfervations with a view to ex- 
on the caufe of variations that he has found in the zenith 
ditances of certain ftars at different times, which do not feem 
explicable 
