OTACOUSTIC INSTRUMENT, or Auricular Tube, an instrument to facilitate the hearing. See ACOUSTICS, no 25.
OTACOUSTIC INSTRUMENT, or Auricular Tube
sub_entry · 104 chars · lineage ↗ · page image at NLS ↗
sub_entry · 104 chars · lineage ↗ · page image at NLS ↗
OTACOUSTIC INSTRUMENT, or Auricular Tube, an instrument to facilitate the hearing. See ACOUSTICS, no 25.