Mr. Eisenberg. Again marked Q-48 and K-1. You took this photograph?
Mr. Nicol. I did.
Mr. Eisenberg. May I have permission to mark this 615?
Mr. Dulles. It shall be admitted.
(The photograph referred to was marked Commission Exhibit No. 615 and received in evidence.)
Mr. Nicol. Looking at the position of the upper arrow, there is a pair of diagonal marks, a small mark immediately below it going down to the lower part of the breech-block markings. There are a series of parallel lines at approximately a 45-degree angle to the division of the bridge. These were duplicated on both—all of the cartridge cases submitted.
Mr. Dulles. I am not entirely clear in my mind what this demonstrates.
Mr. Nicol. This is the basis upon which I arrived at the conclusion that the two cartridge cases, K-1 and Q-48, were fired in the same weapon. Actually, we could take a good match, such as shown here, or even this one, and this would be sufficient. All I have done here is repeat this by moving the two bullets, or the two cartridge cases together the same translated distance, and then taking a series of photographs at each particular position. So they represent actually the same thing in each one.
Mr. Dulles. As the hammer comes down on the cartridge, it makes a distinctive mark, is that the idea?
Mr. Nicol. No. I have not compared the firing-pin impression. What this is is the setback of the shell against the breech face, against the rear of the chamber.