Annealing on the Magnetic Moments of Steel Magnets, 423 

 Table III. — Grlass-hard. 



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 



61-08 

 60-42 

 60-18 

 60-96 

 59-03 



0-79 

 0-90 

 1-11 

 . 0-49 

 1-64 



0-40 

 0-20 

 0-20 

 0-30 

 0-83 



1-19 

 1-10 

 1-31 

 0-79 



2-46 



Mean 



60-33 



0-99 



0-39 



1-37 



Specimen II. 



1 < 



2. ...... 



3 



4 



5 



72-10 



72-70 

 71-50 

 72-70 

 71-80 



1-72 

 213 

 1-30 



213 



2-15 



0-87 

 1-30 



0-88 

 0-87 

 0-88 



2-57 

 3-53 



2-16 

 2-98 

 302 



Mean 



72-16 



1-88 



0-96 



2-85 



Specimen III. 



1 



2 



3 



4 



5 



68-89 

 69-78 

 68-10 

 70-80 

 72-40 



4-72 

 1-27 

 4-78 

 2-49 

 4-08 



2-25 

 1-72 

 1-83 

 2-13 

 1-28 



6-89 

 2-96 

 6-52 

 4-56 

 5-31 



Mean 



70-00 



3-47 



1-84 



5-25 



The above table, as far as it goes, seems to show that the 

 percentage loss in the magnetic moment varies in the order 

 of the quantity of manganese which the specimen contains. 

 Thus specimen III. has a mean total loss of 5*25 per cent., 

 and it has about three times as much manganese as either of 

 the other two ; and specimen II. has about 20 per cent, more 

 manganese than I., and its loss is 3 per cent, nearly, whilst 

 that of I. is approximately 1*4 per cent. 



Specimen I., however, differs very much from the other 

 specimens in the quantity of silicon it contains, and it alone 

 contains sulphur. 



These same fifteen magnets were now all fastened to a 



