W. Anthony Marsh
                                                        10 Webster Ave. Apt. 1-2
                                                           Somerville, MA  02143
                                                                  April 23, 1992

     A comparison of the movements of the JFK limousine occupants as seen in
Zapruder frames 312 through 321 (RB Cutler copies from X - 79). All measurements
start from the front edge of the black reference line drawn through the window
knob. Notice that the distance to the rollbar is not constant. This could be due
to or a combination of various factors, such as variations in copying each
frame, changes in perspective, mismeasurements, or blurring. In fact, some
frames are too blurred to allow measurement. Each measurement of Nellie
Connally's position is to the front edge of her hair. Each measurement of John
Connally's position is to the front edge of his forehead. Each measurement of
Jackie Kennedy's position is to the front edge of her pillbox hat. Each
measurement of JFK's position is to the edge of his hair at the rear of his
head. All measurements were lined up against the chrome strip in the background
for better contrast. Be sure to remember that increasing measurements for the
Connallys represent forward motion, while increasing measurements for the
Kennedys represent rearward motion. All occupants of the limousine were moving
forward at the time of Z312, due to Greer, the driver, having jammed on the
brakes. JFK's head started moving rearward after Z313 in reaction to a shot from
the front.
            Z-frame    rollbar    Nellie     Connally    Jackie      JFK
----------+----------+----------+----------+----------+----------+----------+
 x/60"      Z312        136        106         77          44        159
----------+----------+----------+----------+----------+----------+----------+
difference                9      forward 5  forward 10 forward 6  forward 7
----------+----------+----------+----------+----------+----------+----------+
            Z313        145        111         87          38        152
----------+----------+----------+----------+----------+----------+----------+
difference                2      forward 2  forward 1  rearward 1 forward 1
----------+----------+----------+----------+----------+----------+----------+
            Z314        147        113         88          39        151
----------+----------+----------+----------+----------+----------+----------+
difference                4          0      forward 4  forward 6  rearward 6
----------+----------+----------+----------+----------+----------+----------+
            Z315        151        113         92          33        157
----------+----------+----------+----------+----------+----------+----------+
difference                3      forward 2  forward 1  rearward 1 rearward 9
----------+----------+----------+----------+----------+----------+----------+
            Z316        148        115         93          34        166
----------+----------+----------+----------+----------+----------+----------+
difference                2      forward 2  forward 7  forward 4  rearward 11
----------+----------+----------+----------+----------+----------+----------+
            Z317        150        117        100          30        177
----------+----------+----------+----------+----------+----------+----------+
difference                3      forward 5             forward 2  rearward 5
----------+----------+----------+----------+----------+----------+----------+
            Z319        153        122        NA           28        182
----------+----------+----------+----------+----------+----------+----------+
difference                0      forward 4             forward 3  rearward 14
----------+----------+----------+----------+----------+----------+----------+
            Z320        153        126        130          25        196
----------+----------+----------+----------+----------+----------+----------+
difference                4                            rearward 1 forward 1
----------+----------+----------+----------+----------+----------+----------+
            Z321        157        NA         NA           26        195