Dr. OLIVIER. Yes. These screens are known as the break-type screen. They are silver imprinted on paper and when the bullet passes through it breaks the current. When it passes through the first screen it breaks the current activating a chronograph, counting chronograph. When it passes through the second screen it stops. This is over a known distance, and so the time that it took to pass between the first and the second will give you the average velocity halfway between the two screens. Mr. SPECTER. I now hand you a photograph marked Commission Exhibit 848 and ask you to describe what that shows? Dr. OLIVIER. This was a similar setup used for firing through gelatin. It had clothing and skin over the entrance side only. If it had been placed on the other side it would have just flown off. Mr. SPECTER. And that is similar to that depicted in 846? Dr. OLIVIER. Essentially; yes. Mr. SPECTER. Except that it is---- Dr. OLIVIER. Gelatin instead of the tissues. Mr. SPECTER. Now at what range was the firing performed on the gelatin, goatmeat and horsemeat? Dr. OLIVIER. This firing was done at a 60-yard range. Mr. SPECTER. And what gun was used? Dr. OLIVIER. The 6.5 Mannlicher-Carcano that was marked Commission Exhibit 139. Mr. SPECTER. And what bullets were used? Dr. OLIVIER. The Western ammunition lot 6,000, 6.5 Mannlicher-Carcano. Mr. SPECTER. And was there any substance placed over the gelatin, horsemeat and goatmeat? Dr. OLIVIER. Yes; over the gelatin we had clothing; had a suit, shirt and undershirt, and underneath that a clipped goatskin. The same thing was over the meat, and on the other side of the meat was also clipped goatskin. Mr. SPECTER. Would there be any significant difference to the test by leaving out the undershirt if the President had not worn an undershirt? Dr. OLIVIER. No. Mr. SPECTER. So that the circumstance was simulated with the actual type clothing and a protective skin over the substance just as realistically as you could make it? Dr. OLIVIER. Yes. Mr. SPECTER. What measurement was obtained as to the entrance velocity of the bullet at the distance of 60 yards which you described? Dr. OLIVIER. The striking velocity at an average of three shots was 1,904 feet per second. Mr. SPECTER. And what was the average exit velocity on each of the substances used? Dr. OLIVIER. For the gelatin the average exit velocity was 1,779 feet per second. The horsemeat, the average exit velocity was 1,798 feet per second. And the goatmeat the average exit velocity was 1,772 feet per second. Mr. SPECTER. I now hand you a photograph marked Commission Exhibit 849 and ask you what that picture represents? Dr. OLIVIER. This is one of the gelatin blocks used in that test. It shows the type of track left by the bullet passing through it. That bullet is very stable. Passing through the body and muscle, it would make a similar type wound. Of course, you couldn't observe it that nicely.