KECOKDS or MKKTINGS. 



391 



From the income of the PubHcation Fund, $3,300.08, to l)e used 

 for pubheation. 



From the income of the Rumford Fund, $3,188.20, to l)e used as 

 follows : — 



for Research' $1,000.00 



for Books, periodicals and binding 300.00 



for Publication 600.00 



for use at the discretion of the Committee 1 ,288 . 20 



From the income of the C. M. Warren Fund, $800, to be used 

 at the discretion of the Committee. 



The following preliminary notice was presented by Dr. Francis 

 H. Williams. 



During the war, Mr. Elof Benson invented a method for locating 

 submarine objects, depending upon sound shadows. While I was 

 trying to assist him to get recognition for his method, we both 

 became interested in devices for receiving signals under water and 

 in the air, one of which was a coil made of strips of soft iron cov- 

 ered with a vortex winding of insulated copper wire. When this 

 was connected with an amplifier, we found that it responded not 

 only to electric and magnetic waves, but also to the voice. We 

 failed to understand, nor did any among the physicists to whom we 

 demonstrated our work explain 2chy the coil responded to the voice. 



Finally, one of us attempted to find this explanation, and devised 

 experiments to that end with a modified coil. As one result of 

 these experiments, I desire to state my belief that sound waves 

 can disturb a magnetic field and thus set up a current in a near-by 

 coil. 



I hope at some future time to have an opportunity to present 

 to the Academy an account of these experiments. 



The following Communications were presented : — 



Professor Ephraim Emerton, "The First European Congress." 



Professor Cornelius Van VoUenhoven, "Holland's International 

 Policy." 



The following paper was presented by title: 



"A New ]\Iixed Problem in Partial Differential Equations arising 

 from the Theorj^ of Wind Instruments." By Arthur G. Webster. 



The meeting then adjourned. 



