< ?op ) 
The Tranfits of the Stars over the Meridian, were 
obferved with a Telefcope, fix’d at Right Angles to an 
Horizontal Axis, whofe Ends lay exadtly Eaft and 
Weft ^ by the turning of which Axis, the Line of Col- 
limation of the Telefcope, was conftantly dire&ed in 
the Plane of the Meridian. This Inftrument was daily 
adjufted to a Mark, fix’d in the Meridian ; and in the 
Journal, between the 2d and 3d of February, the 
following Remark was made. 
N. B. This Day was hotter than ufual , as ap- 
pears by the Thermometer ; and the Tran ft t In- 
Jlrument had loft the Level a little , but after we 
had adjufted it, it pointed exaLlly to our Meri- 
dian Mark , and therefore we are at a Jofs for 
the Caufe of this Difterence in the Clock. 
From the foregoing Table it appears, that the Clock 
loft 5-4' 21" in 2 6 Revolutions of the Stars ; that is, 
about z' f’\ in one Revolution j the Difterence from 
this Medium fomewhat varying, upon account of a 
greater, or lefs degree of Heat on different Days. 
The Mean of all the obferved Heights of the Ther- 
mometer from January 26th, to February 18th, 
was about 125 Divifions t Therefore, the Difference 
between the mean Heights of the Thermometer, at 
Jamaica , and London, during the Intervals of the 
refpeftive Obfervations, was 154 Divifions; the Spi- 
rits ftanding fo much higher in Jamaica , becaufe of 
the greater Heat in that Eland. 
That we rnigl.. able to judge, how much the 
different Degrees of B. it, correfponding to any Num- 
ber of Divifions upon this Thermometer, would caufe 
S s 2 . the 
