Mr. SHANEYFELT. Mr. Zapruder's position was known, as he was on the top of the abutment along Elm Street--he stated that he was standing on the abutment. And there is relatively no room to move around there, other than to stand there. It is about 2 feet wide by 3 to 4 feet deep. (At this point, Representative Ford entered the hearing room.) Mr. SHANEYFELT. And aside from that, we checked that position against his photographs and determined that that was in fact correct. Mr. SPECTER. Was the position of Mr. Zapruder confirmed through the use of any other film? Mr. SHANEYFELT. Yes; in Mr. Nix's motion picture films you can see Mr. Zapruder standing on the abutment. Senator COOPER. May I ask a question there? After you had made those calculations to establish the position of Mrs. Muchmore and Mr. Nix and Mr. Zapruder, did you then identify those positions to the three and ask them whether or not it corresponded--your findings corresponded with their recollection as to where they were standing? Mr. SHANEYFELT. We did not do that; no. Mr. Nix, I might say, did state that he went down along this side--the south side of Main Street, along the curb, and it generally conforms to where he stated he went, but he could not place the exact position. We did, by this study. Senator COOPER. Mr. Zapruder's position was established by another photograph? Mr. SHANEYFELT. That is correct. Mr. DULLES. Do I understand you correctly that Mrs. Muchmore didn't realize she had taken the later pictures that appear? Mr. SHANEYFELT. According to her statement, she said after hearing the shots, she panicked, and didn't take any more pictures. Mr. DULLES. You think she did? Mr. SHANEYFELT. On the film there are pictures. Mr. SPECTER. Was the position of Mrs. Muchmore and Mr. Nix ascertained through a geometric calculation, lining up various points as you have just described? Mr. SHANEYFELT. Well, it is actually a geometric calculation, although no strings were drawn or no lines were drawn. It is a matter of standing in a position out there with Mr. Nix's camera, and viewing the two different photographs we had selected, until we arrived at a point that matched. Mr. SPECTER. Was there reasonable mathematical certainty in that alinement, within the limits of your observations of their pictures? Mr. SHANEYFELT. Yes. Mr. SPECTER. Did Mr. Zapruder himself point out his location on the abutment as depicted on Exhibit No. 883? Mr. SHANEYFELT. That is correct. Mr. SPECTER. Now, how many occasions were you a participant in an analysis of these various films which you have just described? Mr. SHANEYFELT. Seven. Mr. SPECTER. And when was the first time that you were a participant in such an analysis? Mr. SHANEYFELT. On January 27, 1964. Mr. SPECTER. And who else has been with you at the time you analyzed those films--just stating in in a general way without identifying each person present on each of the occasions?