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Phonodeik
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<p>The Phonodeik is a <a href="/facts/Sound/DlKXlPuF">sound</a> recording apparatus <a href="/facts/Invent/P3LdUHBY">invented</a> by <a href="/facts/Dayton_Miller/6zsGDddX">Dayton Miller</a> in 1908. The Phonodeik converts sound waves into visual images. The name was suggested by <a href="/facts/Edward_Morley/yNp2YFUe">Edward W. Morley</a>. Before electronic oscilloscopes, this device was used for analyzing sound <a href="/facts/Wave/fU0HH6St">waves</a>. The Phonodeik can be modified to project sound waves on a screen for public demonstration. </p>