ON THE DIRECTIVE POWER OF MAGNETS. 
491 
Large Bar Magnet. 
For attracted point. 
Edge towards small magnets. 
Flat side towards small magnets. 
Longitudinal 
Transversal 
Longitudinal 
Transversal 
Longitudinal 
Transversal 
ordinate. 
ordinate. 
force. 
force. 
force. 
force. 
0-0 
2*2 
-274 
0 
— 250 
0 
1-4 
2*2 
-283 
+ 161 
-260 
+ 137 
2-8 
0.0 
— 262 
+ 315 
— 236 
+ 276 
4-2 
2*2 
- 198 
+ 530 
— 182 
+ 444 
5-6 
2*2 
- 56 
+ 678 
- 36 
+ 540 
7-o 
0.0 
+ 216 
+ 585 
+ 158 
+ 451 
8-08 
1-76 
+ 367 
+ 360 
+ 325 
+ 315 
8-5 
0-7 
+ 580 
+ 166 
+ 552 
+ 184 
0-0 
3*7 
— 160 
0 
-160 
0 
1-4 
3*7 
-147 
+ 73 
-149 
+ 72 
2-8 
3-7 
— 127 
+ 142 
— 123 
-t- 136 
4*2 
3-7 
— 88 
+ 205 
- 79 
+ 185 
5*6 
3-7 
- 19 
+ 235 
— 12 
+ 217 
7-0 
3-7 
+ 49 
+ 205 
+ 51 
+ 190 
8-13 
3-5 
+ 95 
+ 167 
+ 92 
+ 154 
9-12 
2*8 
+ 129 
+ 122 
+ 124 
+ 118 
9-79 
1-84 
+ 159 
+ 88 
+ 157 
+ 82 
10-0 
o-7 
+ 199 
+ 42 
+ 190 
+ 40 
Galvanic Coil. 
For attracted point. 
Coil with 
iron core. 
Coil without core. 
Longitudinal 
Transversal 
Longitudinal 
Transversal 
Longitudinal 
Transversal 
ordinate. 
ordinate. 
force. 
force. 
force. 
force. 
0-0 
2*26 
-310 
0 
— 216 
0 
1-34 
2‘26 
-286 
+ 169 
— 240 
+ 38 
2-68 
2-26 
— 252 
+ 327 
- 315 
+ 120 
4-02 
2‘26 
-193 
+ 477 
— 450 
+ 325 
5-36 
2*26 
- 42 
+ 632 
- 550 
+ 848 
6-7 
2-26 
+ 162 
+ 562 
- 80 
+ 1480 
7-78 
1-70 
+ 380 
+ 420 
+ 1010 
+ 1630 
8-2 
0-74 
+ 790 
+ 296 
+ 2480 
+ 1170 
0-0 
3*73 
- 164 
0 
- 134 
0 
1-34 
3-73 
— 162 
+ 82 
— 189 
+ 41 
2-68 
3-73 
-124 
+ 149 
- 200 
+ 104 
4*02 
3-73 
— 88 
+ 201 
— 217 
+ 212 
5-36 
3-73 
- 19 
226 
- 123 
-f- 383 
6-7 
3-73 
+ 39 
+ 214 
- 57 
+ 424 
7'83 
3-44 
+ 94 
+ 176 
+ 100 
+ 436 
8-82 
2-8 
+ 134 
+ 149 
+ 264 
+ 410 
9+9 
1-82 
+ 186 
+ 99 
+ 475 
+ 338 
9-7 
0-73 
+ 223 
+ 44 
+ 668 
+ 186 
It does not appear possible to infer from these numbers, by any direct analytical pro- 
cess, the law of distribution of magnetism in the bar. It must be done, I believe, 
synthetically, by assuming a law, and computing the forces which would result from 
that law, and then comparing these computed forces with the forces actually observed. 
The only law which I have tried is the supposition that the intensity of magnetism is 
mdccclxxii. 3 x 
