Concord, Mass.
1909
May 19
(No 3)
three hundred yards in diameter and over the
broadest part of the meadow but towards the close of 
his flight he repeatedly doubled back after describing
not more than half or even one third of a full circle.
The full circle was made from left to right that is
from east to south to west to north to east again &
so on over and over the same course. When he turned
back he retraced his course and then turned again,
swinging back & forth from east to south and west
and back to south & east etc. The drumming sound
came to my ears every eight or ten seconds &
invariably just as the bird dipped downward it then
swept up again to his former level. During some
of these downward curves he descended rather 
steeply for a distance of 40 or 50 feet, during 
others the drop was not more than 15 or 20
Drumming of Wilson's Snipe