Mapping the Sounds of the Battle of Gettysburg

No mention of wind direction, which affects sound. Downwind, sound refracts downward toward a listener. Upwind, sound refracts upward away from a listener. We have some idea of the wind direction during the battle, so it would be interesting to compare that against the distance that observers recorded the sounds of that battle. But you also have to known something about the times when firing was heaviest, as well as the periodic lulls. The greatest sound intensity occurred during the grand cannonade in the afternoon of July 3 - not only sound through the air, but also vibrations through the ground.
 
A most memorable moment in the theater in the Abraham Lincoln Library was the cannon firings...the chairs and floor rocked and vibrated as smoke rings went through the air from the left and the right. With the flashes....awesome couple of minutes.
 
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