182 
done in recalling to our recollection the results they labori- 
ously arrived at, results which, perhaps, are still worthy of 
some little attention. 
The following paper was read at the meeting held 
January 23rd, 1877 : — 
“Results of the Monthly Observations of the Magnetic 
Dip, Horizontal Force, and Declination, made at the Mag- 
netic Observatory of the Owens College, from January, 1871, 
to December, 1876, inclusive,'’ by Professor Thomas H. 
CoEE, M.A. Communicated by Professor Balfour 
Stewart, LL.D., F.R.S. 
This paper, containing the results of 3 years magnetic 
observations, is in continuation of a paper by Professor B. 
Stewart in No. 10, Vol. xiii. of the Society’s Proceedings, p. Ill, 
containing the results for 1873 of the Observations for Dip 
and Horizontal Force. For convenience of reference. Dr. 
Stewart’s numbers are incorporated in Tables I. and II. 
The observations were made by Mr. Kingdon and myself 
and latterly by Mr. Poynting, and the two days of the 
month on which they were made were always as near the 
end of the third week or beginning of the fourth week as 
possible. The instruments and methods of observation were 
the same as before. For the declination, which was not 
before observed, in addition to the Unifilar by Elliott Bros., 
a transit Theodolite by Troughton & Simms was used to 
determine the azimuth of a fixed southern mai’k — the highest 
point of the steeple of Heaton Mersey Church. A mean of 
several transit observations of the sun gave the south azimuth 
of the steeple 11° 0' 25^ 
