[ 4+ 1 ] 
i m 59 r ; the thermometer, at a medium, during this 
time, handing at 71. 
Allowing, therefore, the clock to get i m ^ in a 
mean folar day, upon mean folar time, in 23 11 56™ 4 f 
of mean folar time, or in a fidereal day, it will get 
only i m 58*" 4. upon mean folar time: but a clock ad- 
jufted to mean folar time lofes 3™ 56 f by the ftars, 
in - a fidereal day, therefore the clock lofes i rn 57 f T 
of fidereal time, in one revolution of the ftars ; which 
agrees exadlly with what I find by the tranfits e, u, a, 
and £ Leonis. For, April 30, e Leonis palled at 
7 h 32™ 30 f by the clock ; v Leonis at y h 39 111 24 f j 
cl Leonis at y h 55 111 52 f ; and ^Leonis at 8 h 3 m 36^. 
And May 8, e Leonis palled at y h 5 m io r ; u Leonis 
at 7 11 I2 m 3 f ; cl Leonis at y h 28™ 3 i f j and £ Leonis 
at 7 h 36® 15L Therefore, the clock lofes 2 y m 20 1 
by b Leonis, in the fpace of 14 days, and 2 y m 2i f in 
the fame time, by the other three bars : the medium 
is 2 7 m 2o f A; whence the clock lofes upon the bars, 
in one revolution, i m 57 f 4-> which agrees entirely 
with what is deduced above from the tranfits of the 
Sun, which was i m 57 f 4 * 
The fame clock at Greenwich, with the pendulum 
adjufted to the fame length, loft 1 i f upon the ftars, 
in a fidereal day. Therefore, the force of gravity at 
Greenwich is to the force of gravity at St. Helena, as 
the Iquare of 2 3 h 59 111 49 f t° ^ ie ^l uare 2 3 h 5 ^ m t 
:: 10000000 : 99754°5* The extent of the vibra- 
tions of the pendulum here, as well as in England, 
is exactly i° 4^ on each fide of the perpendicular, 
according to the divided arch, which is -at the bottom 
of the pendulum. 
L 1 1 2 I flatter 
