14 The Rev. H. Luoyp on the Determination of the Intensity 
the third column contains the calculated values of w; and the fourth those of 
p®? tan w. In the observations of Series I., II., and III., the lengths of the de- 
flecting and suspended magnets were in the ratio of the numbers 1°224 to 1; in 
those of Series IV. and V., the lengths of the two magnets were equal. 
Series I. Time 115 35™ a.m. ... 0% 36" p.m. 
Magnet away, Scale reading = 496-5... 494-5. 
Dp | 4$(te— Ny) | u D® tan u 
| all eee AR: | 5° 38/395 33344 
2:0 | 146-92 2° 23/13” +33347 
e-5 |) 75°12 1° 13/21” +33343 
Series II]. Time 11°37™ a.m... .0°30™ P.M. 
Magnet away, Scale reading = 495-9... 495-0. 
D | 1 (a — nw) u b* tan u 
1°5 350°61 5° 38/7/75, *33302 
2:0 146°71 2° 23/1” * 33300 
2:5 75-06 esas ame *33317 
Series III. Time 11°5™ a.m... .0525™ P.M. 
Magnet away, Scale reading = 496°4.. . 4943. 
Dp | 270) u petanw | 
1-4167 | 417-24 6° 40/16” 33254 | 
1-8750 177°89 2753! 13% *33242 | 
2-5000 74-96 LOS woe *33275 
Series IV. Time 1°30™ p.m. ... 2°23" P.M. 
Magnet away, Scale reading = 494-4... 494-6. 
D 4 (me. — Nw) u p® tan % | 
1-25 389°70 6° 14/42”-5 *21373 
| 1°50 223°95 3° 37/38” *21393 
| 2-00 94°38 Ca Ys eer 33 *21444 
2°50 48°45 ORAS Ge *21510 
