I found this interesting description in the April 19, 1862 version of the Covington Journal.
The Tone of Bullets
A soldier writing from one of the camps of the Potomac, thus alludes to the particular noise made by bullets passing through the air - "It is a very good place to exercise the mind, with the enemy's pickets rattling close at hand. A musical ear can study the different tones of the bullets as they skim through the air. I caught the pitch of a large-sized Minie yesterday - it was a swell from E to flat F and, as it passed into the distance and lost its velocity, receded to D - a very pretty change. One of the most startling sounds is that produced by the Hotchkiss shell. It comes like the shriek of a demon, and the bravest old soldiers feel like ducking when they hear it. It is no more destructive than some other misses, but there is a great deal in mere sound to work upon men's fears. The tremendous scream is caused by a ragged edge of lead, which is left on the shell. In favorable positions of light, the phenomena can sometimes be seen, as you stand directly behind a gun, of the clinging of the air to the ball. The ball seems to gather up the atmosphere and carry it along, as the earth carries its atmosphere through space.
I'm not really sure how to approach this idea that popped into my head today, but it seems like a good idea or question to mention here ...
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