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XXII. Obfervations of the Immerfons and 
Emerftons of the Satellites of Jupiter, 
taken in the Tear 1768, by Enfign 
George Sproule, of his Majefly s $C)th 
Regiment , on the South Point of the 
Entrance of Gafpee Bafon, which bears 
from Cape Ferrilong, or the Cape forming 
the Bay to the Northward , N. 68? TV. 
by the true Meridian , difant 1 2 1 Ma- 
rine Miles . Communicated by the Afro- 
nomer RoyaL 
Redde, Jan. H E obfervations were made with 
I774 ' JL Mr* short’s reflecting telefcope, 
and the times fhewn by a pendulum time-piece, 
made by Meffieurs mudge and dutton, firft ad- 
jufled to equal or mean time, by obferving the 
paffage of Sirius through a gun barrel fixed in the 
plane of the meridian, with a contraction made in 
the bore of the barrel ; and then proved, in its going, 
by correfponding and fingle altitudes, taken with 
hadley’s quadrant, as often as the weather would 
permit, by reflection from clear oil, placed in a 
room with two windows j one to the S.E. and 
Vol, LXIV. A a the 
