The New Encyclopędia BritannicaEncyclopędia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 34
... vibrations leading to noise ( see VIBRATIONS ) . To protect human ears when control at the source fails , ear plugs have been ingenious- ly designed to cut out loud sounds of certain frequencies while still permitting the hearing of ...
... vibrations leading to noise ( see VIBRATIONS ) . To protect human ears when control at the source fails , ear plugs have been ingenious- ly designed to cut out loud sounds of certain frequencies while still permitting the hearing of ...
Page 39
... vibrations within some region of the sound frequency range if the vibrations have a sufficiently high level of intensity . Many attempts have been made to define hearing , Attempts often with indifferent success . The task is difficult ...
... vibrations within some region of the sound frequency range if the vibrations have a sufficiently high level of intensity . Many attempts have been made to define hearing , Attempts often with indifferent success . The task is difficult ...
Page 47
... vibrations from the ground that are present at a sufficient intensity , this ability is not peculiar to them ; all ears respond to vibrations transmit- ted to the head . Amphisbaenians . The amphisbaenians form a little- known group of ...
... vibrations from the ground that are present at a sufficient intensity , this ability is not peculiar to them ; all ears respond to vibrations transmit- ted to the head . Amphisbaenians . The amphisbaenians form a little- known group of ...
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