Convenience of a Meafurement near Geneva. i jj 
and emerfions of the fatellites of Jupiter, and by fome 
occultations of ftars by the moon. Thefe obfervations were 
performed by the late Profeffor J. A. Mallet, Mr. J. Trem- 
bley, and myfelf. The greater part of them are already cal- 
culated, and their mean refult muft be near the truth. The 
latitude of the fame place would be afcertained by the celeftial 
obfervations eflential to the meafurement, and would verify 
our determination taken from the obferved culmination of ze- 
nith ftars. Laftly, the height of Geneva above the level of 
the Mediterranean Sea (which is fuppofed to be about 196 
toifes) can be obtained with a fufficient precifion from the baro- 
metrical obfervations which for feveral years paft have been 
regularly made here. 
The Obfervatory of Geneva, in which, fince the death of 
my late friend Profeflor Mallet, I have continued a feries 
of obfervations, would be at the free difpolition of the Com- 
miffioners whom the Royal Society (hould think proper to en- 
truft with the whole work. It is furnifhed with the following 
inftruments, and confequently there would be no occafion for 
fending thofe of the fame fort from England. 
i°, A very good tranfit inftrument of 5 feet, made by Sisson. 
The telefcope is achromatic, magnifying about 70 times. 
2°, A quadrant of 2§ feet radius with two achromatic tele- 
fcopes and a micrometer fcrew. The quadrant is moveable on 
an azimuthal circle. The whole made by the fame artift. 
3 0 , Two aftronomical clocks, with gridiron pendulums. 
One remarkably good, made by the late Shelton ; the other by 
Le Paute. This laft might be carried to any of the ftations. 
4 0 , An achromatic telefcope of 10 feet, made by Dollond, 
with three magnifying powers. 
Vol.LXXXI. Q 5°» 
