Pat,
http://www.filedropper.com/210-225
210-225 is the closest comparison I could find for an elevation drop of 10/12inches = .833ft
.82 x 18.18ft = 14.9ft horizontal move = .82 x 12 inches = 9.84inch vertical drop
.833 x 18.18ft = 15.14ft horizontal move = .833 x 12 inches = 10 inch vertical drop
Q: Now, Mr. Shaneyfelt, where 168 appears on that plaque, am I correct in stating that the dot next to 168 represents the position of the location of President Kennedy within the limousine at that time. Is that correct?
A: That is correct, the limousine that we were using for the re-enactment was not the limousine that the President was riding in, and we had to make an adjustment because the stand-in was sitting ten inches higher than the President was sitting, ten inches higher from the street, so after positioning Frame 161, we moved the car forward until we could just barely see the spot on the back of the -- the approximate spot where the President was hit on the back, this appeared based on a ten-inch adjustment, so that we take into account the last clear place that the President could have been shot just before going under the tree.
Testimony from the Clay Shaw trial.
chris
P.S. Once again, the difference in distance between JFK's position in the limo and the limo front end is 15.25 ft.