Was the Followup Car Blocking a Shot at Z313?

[Chris Davidson]

And here are the two shots location per the SS...

4 feet from 5+00 is either 5+04 or 4+96...

WCD298 tells us that Z313 was 262' versus the last shot at 307'. 307-262=45 feet
The legend and the SS statement creates a 39 foot base (5+04 minus 4+65) or a 31 foot base.

From JFK to the front of the limo was about 15 feet
With the adjustment BACK at the top of Elm and forward at the bottom, we have our 30+ feet of difference related to the location of the final shot... (I think that's right, Chris?)

David,

Disregarding WCD298 for now, I believe this is the direct correlation between CE875 and the SS/FBI plat of Feb64, dealing with the Altgens shot.

It appears the measurement was to the street, not JFK'S head on this plat. And, a 3degree slope was used in the calculation.

It would look like this:

Elevation 429.7 = TSBD at street
Plat élévation for last shot at 416.83
Difference = 12.87ft
TSBD window sill= 60.7ft
60.7ft + 12.87ft = 73.57ft
73.57squared x 285squared =294.34hypotenuse = plat entries for shot #3(Altgens)

The 3 degree slope = 5.238% grade = 1ft vertical/19.09ft horizontal ratio
Elevation change at shot#3 = 12.87ft
12.87 x 19.09 = 245.7ft

TSBD = Station# 2+50
2+50 + 245.7ft =Station# 4+95.7 = CE875

chris