Mr. JACKSON. As we turned the corner--or we stopped where the intersection, actually we stopped before we began to turn left onto Elm Street, or rather I would say we hesitated and we were all looking down towards the President's car and I could see two cars going under the underpass. I barely saw the President's car. I would say just the rear end of it as it disappeared under the underpass. Mr. SPECTER. Was that the only time you saw the President's car from the time you made a right-hand turn off of Main Street onto Houston Street? Mr. JACKSON. Yes, sir. Mr. SPECTER. What is your best estimate as to the time span between the first shot you heard and the last shot you heard? Mr. JACKSON. I would say 5 to 8 seconds. Mr. SPECTER. Can you give us a breakdown between the shots which you heard as to how many seconds elapsed between each one? Mr. JACKSON. I would say to me it seemed like 3 or 4 seconds between the first and the second, and between the second and third, well, I guess 2 seconds, they were very close together. It could have been more time between the first and second. I really can't be sure. Mr. SPECTER. Are you sure you heard three shots? Mr. JACKSON. Yes, sir. Mr. SPECTER. Now, will you mark on the overhead shot, which is Exhibit 347, with a "Y" as precisely as you can the position of your automobile at the time you heard the second shot? Mr. JACKSON. With a "Y"? Mr. SPECTER. Yes, please. (Witness marking.) Mr. SPECTER. Would you now mark on the same exhibit the precise position of your car as closely as you can recollect it when you heard the third shot with a letter "Z"? (Witness marking.) Mr. SPECTER. When, in relation to the timing of the shots, which you have described, did you first look toward the Texas School Book Depository Building? Mr. JACKSON. It couldn't have been more than 3 seconds before I looked at that window. Mr. SPECTER. Three seconds from what point in time? Mr. JACKSON. From the last shot. Mr. SPECTER. Did you say from the last shot? Mr. JACKSON. From the last shot, yes, sir. Mr. SPECTER. What is your best recollection or estimate of the speed of your automobile as you were proceeding in a generally northerly direction on Houston Street at the time of the shooting? Mr. JACKSON. I would say not over 15 miles an hour. Mr. SPECTER. What would your best estimate be as to the minimum speed? Mr. JACKSON. Ten, I would say. Mr. SPECTER. Where, in the window were the two Negro men, whom you have described? Mr. JACKSON. Well, there was one in each of those double windows. Mr. SPECTER. On which floor was that? Mr. JACKSON. The fifth floor. Mr. SPECTER. And will you place an arrow where you saw each of those men, please? Mr. JACKSON. Each one of them? Mr. SPECTER. Yes. (Witness marking.) Mr. SPECTER. Did you observe any reaction from either or both of those two men when you saw them? Mr. JACKSON. No, sir. Just looking up.