Retrorecoil 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.
Alvarez' Experiment:
Frame rate of film:
24 frames per second
Bullet: 150 grain soft-nosed
Rifle: 30.06
Distance: rifle 30 meters out of sight on t he left-hand
side of the photographs
Velocity of bullet at impact: about 3,000 ft/sec
Retrograde velocity of the melon: 4.5 ft/sec
Lone Assassin Theory:
Bullet: 160
grain bullet
Rifle: 6.5 mm Mannlicher-Carcano
Distance: 265 feet
Velocity of bullet at impact: about 1800 ft/sec
Using Zapruder's
film Josiah Thompson measured the velocity and acceleration of
the backward motion of the President's head.
Velocity: 1.6
ft/sec averaged over eight frames.
Acceleration: 100ft/sec/sec
