428 Mr. W. Brown on the Effects of Percussion and 



an oil-bath at temperature 236° C. and then allowed to cool 

 in the air as formerly. But this time they were allowed to 

 lie for three weeks, and then magnetized in a manner every 

 way similar to that formerly employed. After being mag- 

 netized they lay undisturbed for a further period of twenty 

 hours, and were then put through the same series of observa- 

 tions as on the previous occasions. The results are contained 

 in the following Table : — 



Table VII. 

 (Annealed for half an hour at 236° C.) 



Specimen I. 



Number of 

 magnet. 



Magnetic 

 moment, 

 per gram. 



Percentage loss due to 

 falling 



Total loss. 



one time. 



three times. 



1 



2 



3 



4 



5 



57-0 

 60-9 

 611 

 60-4 

 60-9 



7-6 

 121 

 10-8 



8-6 

 15-4 



7-5 

 54 

 4-4 

 5-3 

 5-4 



146 



16-8 

 14-8 

 136 

 19-8 



Mean 



60-0 



109 



5-6 



159 



Specimen II. 



1 



2 



3 



4 



5 



60-3 

 609 



58-9 

 604 



58-5 



220 



16-4 

 106 

 170 

 250 



70 

 141 

 16-1 

 16-9 

 10-8 



29-5 

 27-8 

 25-0 

 311 

 32-8 



Mean 



59-8 



18-2 



12-9 



29-2 



Specimen III. 



1 



2 



3 



4 



5 



561 

 56-9 

 561 



58-2 

 58-2 



166 

 106 

 174 

 23-0 

 20-0 



95 



14-6 



99 



6-2 

 14-2 



24-6 

 221 

 25-9 

 27-6 

 310 



Mean 



571 



17-5 



10-8 



26-2 



. — 



We here find that the second annealing at a high tempera- 



