and the Maximum of Magnetism of Iron, Steel, and Nickel, 151 



Each observation given is almost always the mean of several. 

 D.T.G. is the mean of four readings, two before and two after the 

 observations on the magnetism; D.C. is the mean of from four 

 to ten readings ; D.F. mean of three ; D.B. mean of two, except 

 in Table I., where the deflection was read only once. In all 

 these Tables the column containing the temporary magnetism T 

 can only be accepted as approximate, the experiments having 

 been made more to determine Q than T. 



The value of n was generally varied by coiling a wire more or 

 less around the ring, but leaving its length the same. 



The change in the value of D.C. is due to the change in the 

 resistance of the galvanometer from change of temperature, 

 copper wire increasing in resistance about 1 per cent, for every 

 2°*6 C. rise. In Table I. the temperature first increased slowly, 

 and then, after remaining stationary for a while, fell very fast. 



Table I. 

 "Burden's Best" Iron, Normal. 















D.F. 



D.B. 







X. 



X 





C.T.G. 



D.T.G. 



M. 



D.C. 



n. 



D.F. 



'W 



n 



Q. 



X. 



Calcu- 

 lated. 



r$- 



T. 



48 



4-5 



•1456 



234 



30 



6-5 



•1083 



•08 



715 



4910 5845 



390-7 



528 





16-45 



•5501 



... 





54-6 



•910 



•59 



6005 



1092010885 



868-7 



3894 





20-2 



•6815 







87-9 



1-465 



•80 



9667 



1418014074 



1129 



5280 





286 



1011 



23 : 3 



10 



74-2 



3 71 



1-34 



24600 2433024000 



1936 



8882 





311 



1119 







88-2 



4-41 



1-48 



292302612026050 



2078 



9811 





31-9 



1-155 



... 





92-6 



4-63 



1-53 



3082026690 



26660 



2124 



10180 





41 12 



1-623 





"2 



298 



7-45 



20 



4959030570 



30740 



2433 



13310 



27 



28-35 



1-766 



231 





32-8 



8-20 



2-5 



5482031030 



31050 



2470 



16710 





29-6 



1-861 







34-6 



8-65 



2-65 



5782031070 



31100 



2472 



17710 





33-4 



2162 



231 





39-8 



9-95 



2-85 



6651030770 



30776 



2448 



19050 





3745 



2-512 







44-7 



1118 



3-05 



74730;29750 



29930 



2367 



20390 





44-45 



3223 







53-5 



13-38 



3-85 



8943027750 



27390 



2208 



25740 





521 



4-225 







60-3 



1508 



4-85 



10080023860 



24730 



1899 



32420 



9 



34-65 



6-744 







731 



18-28 



7-10 



122700 



18210 



18410 



1448 



47680 





39-8 



8-136 



230 





77-3 



19-32 



7-90 



129700 



15940 



16130 



1269 



53040 





44-3 



9-542 



... 



1 



40-6 



20-30 



91 



136300 



14280 



13920 



1137 



61100 





551 



1404 



• . > 





43-5 



21-75 



98 



145400 



10360 



10760 



824-1 



65510 



3 



42-95 



2718 



• •■ 





47-4 



23-70 



11-5 



157700 



5803 



6350 



461-8 



76540 





51-3 



36-60 







491 



24-55 



12-7 



162700 



4445 



4523 



353-8 



84180 





6015 



5118 



CO 



234 





50-3 



2515 



13-2 



166000 

 175000 



3243 



3310 

 



258-0 



87120 



