446 Prof. F. Kohlrausch on the Increase and Decrease 



Zinc Wires. 





No. 5. 



No. 6. 



Resistance. 



Difference. 



Resistance. 



Difference. 



u 







u 







u 



c 



u 



c 



U 







u 







u 



c 



u 



c 



u 







u 







u 







u 



c 



u 



c 



u 







•14003 

 077 

 095 

 104 

 128 

 135 • 

 146 

 149 

 160 

 164 

 173 

 178 

 186 

 190 

 200 

 205 

 212 

 219 

 227 

 239 

 244 

 257 

 261 

 270 

 272 

 278 

 278 

 295 



Wire 



+ •00014 

 + •00018 

 +•00009 

 + •00024 

 +•00007 

 + •00011 

 + •00003 

 +•00011 

 +•00004 

 + •00009 

 + •00005 

 +•00008 

 + •00004 

 + •00010 

 +•00005 

 +•00007 

 +•00007 

 + •00008 

 +•00012 

 + •00005 

 + •00013 

 +•00004 

 +•00009 

 + •00002 

 + •00006 



+•00017 

 broke. 



•14038 

 065 

 090 

 087 

 119 

 117 

 138 

 138 

 152 

 149 

 164 

 163 

 178 

 180 

 191 

 193 

 205 

 208 

 218 

 221 

 230 

 235 

 245 

 251 

 270 

 288 



Wire 



+ •00027 

 + •00025 

 -•00003 

 +•00032 

 -•00002 

 + •00021 



+ -00014 

 -•00003 

 + •00015 

 -•00001 

 + •00015 

 + •00002 

 +•00011 

 + •00002 

 +•00012 

 + •00003 

 + •00010 

 + •00003 

 + •00009 

 + •00005 

 + 00010 

 + •00006 

 + •00019 

 + •00018 



broke. 



XLIX. On the Distance between the Poles of a Magnet, the 

 Coefficients of Temperature and Induction, and on the Deter- 

 mination of Moments of Inertia by means of Bifilar Suspension. 

 By F. KOHLRAUSCH*. 



WHENEVER a magnet forms the object or means of any 

 measurement, there are especially the following pro- 

 perties to be taken into account. Besides its magnetic moment, 

 the changes in the same with temperature and with the position 

 in the magnetic field play an important part, the distribution 

 of magnetism in the bar, and, as a first approximation, the dis- 

 tance apart of the poles of the magnet is of importance ; and 

 the moment of inertia of the heavy mass has to be taken into 

 account in all the usual methods of observation. 



* Translated from Weidernaim's Annalen, Bd. xxii. p. 411. 



