494 MR JAMES RUSSELL ON THE SUPERPOSITION OF MECHANICAL VIBRATIONS 



Annealed Steel. 



Quenched Steel. 



16/3/06. 



Without Load. 



With Load. 



18/3/06. 



Without Load. 



With Load. 



H 



Bo 



B L 



H 



B 



B L 



•27 



142 



148 



•45 



100 



105 



•42 



252 



258 



•95 



260 



270 



•78 



594 



630 



1-15 



345 



352 



1-02 



915 



1000 



L50 



515 



520 



1-22 



1420 



1640 



2-18 



1000 



1030 



1-46 



2742 



3310 



2-93 



1960 



2035 



1-81 



6050 



6900 



3-83 



3390 



3460 



3-20 



12880 



12940 



5-57 



5620 



5760 



4-85 



14520 



14600 



7-62 



7460 



7580 



573 



15000 



14930 



8-75 



8105 



8250 



Annealed Nickel. 



Quenched Nickel. 



21/3/06. 



Without Load. 



With Load. 



22/3/06. 



Without Load. 



With Load. 



H 



Bo 



B L 



H 



B 



B L 



•26 



40 



34 



1T3 



38 



36 



■62 



122 



91 



1-50 



51 



45 



1-06 



348 



200 



2-17 



123 



94 



1-27 



592 



284 



3-9 



257 



224 



1-86 



1560 



697 



5-8 



353 



329 



3-65 



2936 



1900 



8-18 



510 



465 



5-44 



3610 



2660 



9-45 



890 



626 



7-48 



3900 



3080 



14-0 



2330 



2150 



8-50 



4050 



3280 



23-2 



3200 



3060 



After annealing or quenching, as the case may have been, the wires were, by means 

 of a revolving commutator, demagnetised by decreasing reversals without load, after 

 which the measurements given under columns B were obtained. Each measurement is 

 one-half of the average induction change obtained ballistically on the 30 th and 35 th 

 ( + and - respectively) reversals of the magnetising force H. 



The wires were again demagnetised and then linked between the electric bell and 

 the L-shaped lever, which operation puts on the load. By intermittent pressure on the 

 lever the load was virtually put "oft'" and "on" twelve times. The wires were again 

 demagnetised by decreasing reversals, and the measurement given under columns B t 

 (induction with load) taken, the same routine being observed as before. H, B , and B L 

 are in C.G.S. units. 



It will be noticed that the effect of the load to increase magnetisation is greater for 

 annealed than for quenched steel, and that in the former condition only has the Villari 

 critical point just been reached. Annealed and quenched iron exhibit respectively 

 similar although somewhat less differences, and for this reason the readings have not 



