Proceedings of the stated meeting held Wednesday, November 18, 1914

✍ Scribed by R.B. Owens

• Publisher: Elsevier Science
• Year: 1914
• Tongue: English
• Weight: 51 KB
• Volume: 178
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(14)90435-5

✦ Synopsis

Additions to membership, 4-Mr. George R. Henderson, chairman of the Committee on Science and the Arts, introduced Mr. Arthur Atwater Kent, of Rosemont, Pa., and Mr. Elmer A. Sperry, of New York City, who had been recommended to the Board of City Trusts of ~Philadelphia for the award of the John Scott Legacy Medal and Premium, the former for his Ignition System, and the latter for his Gyro Compass. The Chairman then presented the medals to the recipients.

Dr. Dayton C. Miller, of the Case School of Applied Science, Cleveland, Ohio, was then introduced and presented an interesting communication on " The Photography and Analysis of Sound Waves." He discussed the wave theory of sound, and described, by means of models and lantern slides, the form of the waves of sounds composed of a fundamental tone and overtones. With the aid of lantern photographs, Dr. Miller described the phonodeik, an apparatus for obtaining photographic records of sound waves, and gave the results of experiments made in the Case School in analyzing sounds from the various musical instruments and from the human voice. He outlined the method of analyzing the records obtained with this apparatus by means of Fourier's theorem, and gave some of the mathematical results obtained. At the close of his remarks he showed on the screen impressions received in a projecting phonodeik from the voices of a number of persons in the audience, from a violin, and from a talking machine. In all cases the forms of the waves were clearly seen. The thanks of the meeting were extended to the speaker and to the artists and others who assisted in the demonstration.