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Estimate the height of the game at the moment it was shot, then measure, by stepping, the distance the dead (not wounded) bird travels before it touches the flat ground. Air resistance to the fall of the bird will be practically just equal to air resistance to its onward movement after it is dead, and the time it takes to fall, and necessarily also to go forward the measured distance, are the same. The time taken for the fall may be safely calculated by the height in feet divided by 16, and the square root of the dividend is the number of seconds of the fall. Thus, if the bird falls 64 feet, then 64

16 = 4, and the square root of 4 is 2 seconds. In 3 seconds the game falls 48 yards, so that practically all pheasants take between 2 and 3 seconds to fall, or ought to do so.

The velocity the bird is travelling before being shot does not affect the time it takes to reach the ground, but wind, with or against the game, slightly alters the distance it goes forward after being killed. With the wind the game will always be going faster than the air, and will therefore be getting air resistance from the front, and the method only partially breaks down when a heavy wind is blowing directly against the game.