f 87 ) 
lation 4’* 30". We may therefore from hence conclude, 
' that on Sept.xi^ N.S. the true Emerfion at Wanfted pre- 
ceded the Calculation by the Tables about 3' 35^^ and 
that the true Emerfion there was at iih. Apr.i ; 
but this Emerfion was obferved at Lisbon at nh. 14^ 
55'', the Difference being ^ 6 / lo". 
The Obfervations at Wanfle^l being made with Mr. 
Refleding Telefcope (by which one may fee 
the Firft Satellite near ■? of a IVIinute fooner when tis 
Emerging, than in a Refrading Telefcope of 15 Feet> 
and the contrary when ’tis Immergingl there ought to 
be feme Allowance made on account of different Te- 
lefcopes made ufe of at Lhhon and WanfleA^ by de^ 
ducting 10 or 15/' from the Difference of Time col- 
ledfed from the Immerfions, and adding as much to the 
Difference deduced from the Emerfions. Such Corre- 
d:icn being made, the Difference of Meridians by the 
Immerfion obferved 28, will be 37- and by 
the Emerfion Sept.^i^ 36' 35^'. 
The Emerfion obferved at Lisbon^, Decemh. 8, N.S. 
at 8h. 32^ 40" Apparent Time, was likewife fecn at 
Wanfled in a 15' Foot Tube at 9b. 10^ ly" Apparent 
Time, the Air being a little hazy, which may probably 
make the Difference 37' 25''' a little too great. 
The Emerfion feen at Lisbon Jein. i6, 1726, N. S. at 
^h. 51^ which feems accompanied with Circum- 
fiances that argue its Exadlnefs, w'as likewife very well 
obferved at Wanfled in a 15 Foot Tube at 7I1. 28 • 22^' 
Apparent Time, the Difference being 37^ i2^'. 
Thefe are the only Obfervations among thofe whidi 
were iafl communicated, that I could compare witli 
any degree of Certainty with my own : But I find o- 
thers printed in the Philcfoph, Tranfa^. N^. 385, which 
were likewife made by the fame curious Perfons, who 
obferved an Emerfion of the Firft Satellite at Lisbon 
L 2 Sep- 
