Mr. Redlich. The primer being the portion of the cartridge which ignites the principal explosive substance in the cartridge; is that correct?
Mr. Gallagher. The primer is that portion of the cartridge which is——
Mr. Redlich. If I may interrupt—which is initially struck by the firing pin?
Mr. Gallagher. Which is struck by the firing pin, and detonates to initiate the explosive charge in the cartridge itself.
Mr. Redlich. Now, are the elements barium and antimony found in most primer residues?
Mr. Gallagher. Barium and antimony are found in most primer residues; yes.
Mr. Redlich. Did you determine whether barium and antimony are present in the Western Cartridge Co. ammunition which was found on the sixth floor of the Texas School Book Depository?
Mr. Gallagher. I did, sir.
Mr. Redlich. And did you find that barium and antimony are, in fact, found in ammunition of that manufacturer?
Mr. Gallagher. Yes.