Description of Sound.

Feet. .

Miles

A powerful human voice in the open air and no wind .................

..460

....

Beating a drum ............

.10,560.

.. 2

Music of a heavy brass band ................

15,840

...3

A strong human voice with a breeze barely felt..........

.15,840,

...3

Report of a musket ........

16,000

...3

Cannonading, very strong .................

475,000.

..90