Mr. Dulles. Would you have to make a similar adjustment to the overpass?
Mr. Shaneyfelt. Yes; because the angle to the overpass is based on the horizontal. The overpass, you would have to add the 3°9´.
Mr. Dulles. From the overpass, is this an angle up or angle down?
Mr. Shaneyfelt. This is an angle down.
Mr. Dulles. So it is an angle down in both cases?
Mr. Shaneyfelt. That is correct.
Mr. Specter. When you say that you are reducing the angle of 15°21´ by 3°9´ to an angle of 12°12´, is that as the shot passes through the body of the President?
Mr. Shaneyfelt. That is correct. It is at that point.
Mr. Specter. How was the speed of the camera ascertained, Mr. Shaneyfelt?
Mr. Shaneyfelt. We obtained from Mr. Zapruder, Mr. Nix, Mrs. Muchmore; their cameras for examination, and in the FBI laboratory exposed film in all three cameras, aiming, focusing the camera on a clock with a large sweep-second hand. We then ran the camera at the speed and conditions as described by the people who used the cameras. We ran through several tests of film, and then after the film was developed it was studied under magnification, and frames were counted for a period of 2 to 3 seconds or for the full running time, and averages were taken.