458 Astronomical and Magnetical Ohervations, [Junb^ 



Article VIII, 



Astronomical and Magnetical Observations at Hackney JVicL 

 By Col. Beaufoy. 



Latitude 51° 32M0" North. Longitude West in Tiaie 6-82". 

 1813. 



Time at H. W. Time at Greenwiclsc 



April 22, Emersion of Jupiter's 4th satellite 8fi 56' 59" 8^57' 05-82" 



April 26, Immersion Ditto 3d Ditto 8 33 01 8 33 01-82 



May 4, Emersion Ditto 1st Ditto 9 16 15 9 16 21-82 



May 15, Emersion Ditto 2d Ditto 10 04 19 10 04 25-82 



N. B. The Observations are according to Mean Time. 



Rain between the 31st of March and the let of May, 1-624 inches. 



In tbe observations set down in the Annals of Philosophy^ 

 N° IV. an error is committed in deducing the time at Green- 

 wich ; the longitude should have been added to the time at 

 H. W., instead of being subtracted. 



Olservations on the Variation of the Needle continued. 



Month. 



April 17 

 Ditto 18 

 Ditto 25 

 Ditto 26 

 Ditto 27 

 Ditto 28 

 Ditto 29 

 Ditto 30 



Mean 



Morning Observ. 



Hour. 



9h 00' 

 8 45 



8 25 



Variation^ 



24° 08' 15" 

 24 04 15 



24 14 55 



31 124 09 18 



Noon Observ. 



Evening Observ. 



Hour. 



Ih 20' 

 1 30 

 1 15 



1 15 

 1 10 



12 59 



Variation. 



240 22' 05" 

 24 24 52 

 24 24 12 



24 22 07 

 24 20 40 



24 21 12 



Hour. 



6^ 30' 

 8 30 



7 00 

 7 00 



5 30 

 7 20 



5 46 



Variation. 



-240 15' 52" 

 24 11 40 



24 19 40 

 24 17 42 



24 15 20 

 24 12 35 



24 15 25 



The mean of all the observations made in April, and in« 

 eluding those of the 30th and 31st of March, is as follows; — 



f Morning at 8h 31' .. . .Variation 24° 09' 18"^ 



Observations ^Noon at 12 59 Ditto 24 21 12 i West. 



(Evening at 5 46 ....Ditto 24 15 25 > 



