1815.] Astronomical and Magnetical Observations, 

 square of -v^ 



413 



( i^~x- I V - 3 + v^ 4- + i^/-3) + 2, which is cer- 

 tainly not equal to i-y79H«)-. 



Query tlie cause of this anomaly, if we admit the ambiguity to 

 arise as stated by your Garrespondent R. N, D. ? 



Yours, &c, 



Mathematicus. 



Article IX. 



Astronomical and Magnetical Observations at Hackney IVick. 



By Col. Beaufoy, 



Latitude, 51° 32' 40-3" North, Longitude West in Time 6"-^. 



April 26, Emersion of Jupiter's fllh 8' 50" Mean Time at Hackney Wick, 



1st Satellite \\\ 8 b1 Ditto at Greeuwicli. 



May 4, Immersion of Jupiter's f 10 I 49 Ditto at Hackney Wick. 



3d Satellite \lO 1 56 Ditto at Greenwich. 



May 4, Emersion of Jupiter's/12 41 07 Ditto at Hackney Wick, 



S"d Satellite tl2 41 14 Ditto at Greenwich. 



May 12, Emersion of Jupiter's f 9 26 14 Ditto at Hackney Wick. 



IrtSateUite 1.9 26 21 Ditto at Greenwich, 



Magnetical Observations. 



1815. 



