112 
the property of The Owens College, erected in the garden of 
Professor Stewart, no iron whatever being used in its 
erection. 
The latitude of the house is 53° 26' N., and its longitude 
2° 13' W. The observations were chiefly made by Mr. F. 
Kingdon, assistant at the Physical Laboratory of Owens 
College, in the presence of students who were receiving 
instruction. 
These conditions are not so favourable to minute accuracy 
as where the observations made are not combined with 
instruction to pupils : nevertheless it is believed that the 
following table will exhibit fairly accurate values of the 
magnetic dip and horizontal force for the year 1873. 
The instruments used had been previously verified at the 
Kew Observatory. They consist of a Dip circle by Dover 
and a Unifilar by Elliott Bros. The dips are generally the 
mean results from two 
needles. 
1873. 
Dip. 
Horizontal Magnetic 
intensity. 
January ... 
.. 69° 19'-5 
February ... 
... 69° U'*6 
March 
... 69° 17'-6 
3*693 
April 
... 69°18'-9 
May 
... 69° 17'-7 
3*686 
June 
... 69° 16'-1 
3*684 
July 
... 69°14'-6 
3*704 
August 
... 69°20'-2 
3*704 
September... 
... 69°23'-8 
3*715 
October 
... 69° 16'-8 
3*661 
November... 
... 69° lF-4 
December . . . 
... 69° 18'’3 
3*686 
