20-02-2015, 02:50 AM
Drew,
The shot labeled as#3:
I believe this is the direct correlation between CE875 and the SS/FBI plat of Feb64, dealing with the Altgens shot.
The shot labeled as#3:
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
Attached is the "angle to horizon" from ground to rifle.
chris
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
Attached is the "angle to horizon" from ground to rifle.
chris