binaural stethoscope

The modern binaural stethoscope with two ear pieces was invented in 1851 by Arthur Leared.

Cammann also wrote a major treatise on diagnosis by auscultation, which the refined binaural stethoscope made possible.

In 1851, Irish physician Arthur Leared invented a binaural stethoscope, and in 1852 George Cammann perfected the design of the instrument for commercial production, which has become the standard ever since.