Phonodeik
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The Phonodeik is an sound recording apparatus invented by Dayton Miller in 1908. The Phonodeik convert sound waves into visual images. The name was suggested by Edward W. Morley. Before electronic oscillators, this device was used for analyzing sounds waves. The Phonodeik can be modified to project sound waves on a screen for public demonstration.
Description
The Phonodeik used photographic material to record sound. A diaphragm receiver of thin glass is at the end of a resonator horn. Behind the diaphragm is a steel pulley spindle mounted in jeweled bearings with an attach mirror and oscillating tension spring. Wrapped on the pulley spindle is thin silk fibers or platinum wire turning around the mirror with amplitude. The sound vibrates the diaphragm on the bottom and a light beam is reflects to the sensitive photographic paper (or a projection screen).
See also
External links and references
- "Lecture III -- Methods of recording and photographing sound waves -- Phonodeik (http://www.srm.com/1916/lecture3phonodeik.html)". The science of musical sounds.
- Hoekje, Peter L. and William Fickinger, "Acoustic teaching apparatus before 1929 at the Case School of Applied Science (http://adsabs.harvard.edu/cgi-bin/nph-bib_query?2001ASAJ..115.2492H)".
- Gilliam, L., and W. Lichtenwanger, "The Dayton C. Miller Flute Collection: A Checklist of the Instruments (http://memory.loc.gov/ammem/dcmhtml/dmbio.html)". Washington, D.C.: Library of Congress. 1961. [via American Menory]
- Greenslade, Jr., Thomas B., "The Sonograph (http://physics.kenyon.edu/EarlyApparatus/Acoustics/Sonograph/Sonograph.html)". Instruments for Natural Philosophy (http://physics.kenyon.edu/EarlyApparatus/index.html), Kenyon College, Gambier, Ohio.
- "fonodčik (http://www.sapere.it/gr/ArticleViewServletOriginal?otid=GEDEA_fonodeik&orid=GEDEA_fonodeik&todo=LinkToFree)". Enciclopedia Generale. (Italian)
- Miller, Dayton, Sound Waves: Their Shape and Speed (http://vax.vmi.edu/MARION/AAD-1840). 1937.