450 proceedings: philosophical society 



operation, as well as the influence of jarring upon the nature and amount 

 of the lag. 



The paper was illustrated by lantern slides. 



The paper was discussed by Messrs. C. A. Briggs and W. P. White. 



The second paper was presented by Mr. R. L. Sanford on Magnetic 

 analysis. 



This paper gives a definition of magnetic analysis and briefly dis- 

 cusses the scope of the subject. 



It points out that a method which makes possible the testing of 

 steel and steel products without in any way injuring the product gives 

 promise of having very great commercial value. 



The very strict correspondence between the magnetic and mechanical 

 properties may serve as the basis for such a non-destructive method of 

 inspecting steel products by comparison with tested samples which thus 

 constitute standards of quality. 



The proper interpretation of the results of magnetic analysis re- 

 quires a full and complete knowledge of the correlations existing be- 

 tween magnetic and other properties of steel. Much remains to be 

 done along this line. 



A number of applications of magnetic analysis that give promise of 

 practical value are described. Each type of problem requires an indi- 

 vidual solution and there are many types of problems. 



It is not by any means to be claimed that magnetic analysis will 

 displace any of the present well established methods of metallography. 

 On the other hand, it bids fair to develop into a powerful tool in 

 the hands of the investigator as well as a rapid and accurate means 

 for the testing of steel and steel products. 



The paper was illustrated by lantern slides. 



Discussion. — This paper was discussed by Messrs. White, Sosman, 

 C. A. Briggs, Dickinson, Crittenden, Herschel, and Agnew. 



Adjournment took place at 9.50 p.m. and was followed by a social 

 hour. 



S. J. Mauchly, Recording Secretary. 



