in a melon hit by a high-velocity frangible bullet
fired from a rifle off the left side of the frames.
The forward jet stream to the right propelled the
melon backward to the left. No jet stream is seen
in the Zapruder film that even remotely resembles
the stream in Alvarez's experiment.
Frame rate of film: 24
frames per second
Bullet: 150 grain soft-nosed
Distance: rifle 30 meters out of sight on t
he left-hand side of the photographs
Velocity of bullet at impact: about 3,000
Retrograde velocity of the melon: 4.5
Rifle: 6.5 mm Mannlicher-Carcano
Distance: 265 feet
Velocity of bullet at impact: about 1800
film Josiah Thompson measured the velocity and acceleration
of the backward motion of the President's head.
ft/sec averaged over eight frames.