Homemade machine designed to detect the sound of an airplane motor
Item
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Title (Dublin Core)
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Homemade machine designed to detect the sound of an airplane motor
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Article Title and/or Image Caption (Dublin Core)
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Listening for the Whir of an Airplane Motor
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extracted text (Extract Text)
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THE characteristic purr of airplane
motors was always a cause for excite-
ment among children; and, now that
the war is over and the sky is comparative-
ly clear of airplanes, children miss them
very much—particularly the two young-
sters in the picture above. Their father
had rigged up for them an outfit for de-
tecting the sound of an airplane motor
long before the ear, unaided, could catch
the sound.
An old phonograph arm forms the basis
of this mechanism. A large horn is at-
tached to it, which is turned skyward to
gather in sounds. At the other end of the
arm a wire—instead of a needle—is at-
tached which runs up into the head-gear.
This head-gear, which fits the head just as a
telephone receiver does, has two small mag-
nets within it for reproducing the sounds.
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Language (Dublin Core)
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eng
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Date Issued (Dublin Core)
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1919-02
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pages (Bibliographic Ontology)
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16
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Rights (Dublin Core)
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Public domain (Google digitized)
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Archived by (Dublin Core)
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Davide Donà
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Marco Bortolami (editor)
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Spatial Coverage (Dublin Core)
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Europe
Popular Science Monthly, v. 94, n. 2, 1919
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