228 



The Astronomer Koyal's Experiments on 



direction of the forces near the ends. Using the term " pole " 

 to denote that point near the extremity to which the directions 

 of forces rudely converge, the pole of the steel magnet is within 

 the magnet, and distant from the end by about -^ of the 

 magnet's length : but the pole of the galvanic coil is absolutely 

 at its end ; indeed some of the experimental directions of force 

 fall a little beyond the end. 



It is evident, from the remarks of Nos. 6 and 7, that a 

 magnet cannot in any wise be represented as a system of 

 revolving galvanic currents, with an equal number of circuits at 

 every part of its length. 



With the view of presenting the results in the form which 

 may probably be found most advantageous for comparison with 

 the conclusions from any future theory, I have resolved the 

 forces into rectangular directions, parallel and transversal to the 

 axis of each magnet, by the following graphical process. Upon 

 each mean line of direction of force (ascertained as is described 

 above) I have laid down the mean measure of the force (as 

 found above), and upon this measure as hypotenuse I have 

 constructed a right-angled triangle, the lengths of whose sides 

 give the two forces. From the nature of the preceding opera- 

 tions, it is only necessary to form these numbers for one 

 quadrant of each magnet. The results are given in the follow- 



ing Tables. 



Large Bar Magnet. 



For attracted point. 



Edge towards small 

 magnets. 



Flat side towards 

 small magnets. 



Longi- 



Trans- 



Longi- 



Trans- 



Longi- 



Trans- 



tudinal 



versal 



tudinal 



versal 



tudinal 



versal 



ordinate. 



ordinate. 



force. 



force. 



force. 



force. 



00 



22 



-274 







-250 







1-4 



2-2 



-283 



+ 161 



-260 



+ 137 



2-8 



22 



-262 



+315 



-236 



+276 



4-2 



22 



-198 



+530 



-182 



+444 



5-6 



22 



- 56 



+678 



- 36 



+540 



7-0 



22 



+216 



+585 



+ 158 



+451 



8-08 



176 



+367 



+360 



+325 



+315 



8-5 



0-7 



+580 



+ 166 



+ 552 



+ 184 



00 



3-7 



-160 



o 



-160 







1-4 



37 



-147 



+ 73 



-149 



+ 72 



2-8 



37 



-127 



+ 142 



-123 



+ 136 



42 



37 



- 88 



+205 



- 79 



+ 185 



5-6 



37 



- 19 



+235 



- 12 



+217 



70 



37 



+ 49 



+ 205 



+ 51 



+ 190 



813 



35 



+ 95 



+ 167 



+ 92 



+ 154 



912 



28 



+ 129 



+ 122 



+ 124 



+ 118 



979 



1 84 



+ 159 



+ 88 



+ 157 



+ 82 



100 



07 



+ 199 



+ 42 



+ 190 



+ 40 



