

PROCEEDINGS OF THE ACADEMY AND AFFILIATED 



SOCIETIES 



THE WASHINGTON ACADEMY OF SCIENCES 



The 78th meeting of the Washington Academy of Sciences was de- 

 voted to an exhibit, 8-11 p.m., March 28, 1912, in the New National 

 Museum, of new apparatus, methods, and results from various govern- 

 ment bureaus and other scientific institutions of Washington. Over 

 twenty bureaus and scientific institutions took part in the exhibit, and 

 together rendered it one of tne most instructive and enjoyable occasions 

 the Academy has ever had. Over 600 persons, members of the Academy 

 and their friends, attended this meeting, and everyone saw interesting- 

 apparatus and valuable results he had never even heard of before. Indeed 

 this exhibit was so entirely successful that a similar exhibit probably 

 will be given again in a year or two. 



The 79th meeting was held jointly with the Philosophical Society, 

 Saturday evening, May 4, 1912, at the Cosmos Club. Prof. Dayton 

 C. Miller of the Case School of Applied Sciences, Cleveland, Ohio, 

 gave an illustrated and experimental lecture on Sound-waves; how to 

 photograph them and what they mean. 



Both the synthesis and the analysis of sound-waves were shown and 

 explained, and, to the delight of everyone present, many musical notes 

 produced by tuning forks, by the flute, and by the speaker's voice, were 

 made to trace upon the screen, as by a moving master hand, their won- 

 derful curves of harmonic complexity. 



It is not often that an audience finds itself really instructed on a 

 difficult scientific question and at the same time so charmed and delighted 

 as to wish the lecture twice as long, but this was one of those rare occa- 

 sions. W. J. Humphreys, Recording Secretary. 



THE PHILOSOPHICAL SOCIETY OF WASHINGTON 



The 708th meeting was held on April G, 1912, Vice-President Burgess 

 in the chair. One paper was presented : 



Evolution of the aeroplane; its fundamental features of English origin: 

 A. F. Zahm. 



Two informal papers were presented, one on Earth light and one on 

 Holes in the air, each by W. J. Humphreys, of the U. S. Weather Bureau. 



709th meeting, April 20, 1912, Vice-President Burgess in the chair. 

 One paper was presented. 



Account of researches in the algebm of physics: Alexander Macfar- 



LANE. 



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