The SS and FBI place 4 shots in and around Z313 - just not Z313

[Chris Davidson]

Chris -


423.07 elevation for the "1st" shot as told in the legend is somewhere between Z255 and Z313.
The final shot's 416.83 elevation is nowhere near Z313 - in fact a 3 degree slope has a 19:1 rise/run means that 421.73 - 416.83 = 4.9 vertical feet lower.
What this means - I think - is that for every 1 foot of vertical decline the vahicle traveled 19 feet so that a spot at #3 in the graphics below would be 95 feet further down Elm than where this legend places Z313.
Regardless of speed, the run distance at a 3 degree angle is straight math... http://www.1728.org/gradient.htm

Help with some of the other items.

The Elm St. slope is 3degrees 8minutes = 3.13 degrees. Interesting in terms of a possible relationship with 313 zframes.

3.13 degrees = a ratio of 1FT vertical to 18.3FT horizontal. Interesting in terms of a possible relationship with a 18.3 frames per sec camera.

chris