Mr. Eisenberg. And the right-hand side of that photograph, marked C-6?
Mr. Frazier. It is a test cartridge case, fired in the rifle Exhibit 139.
Mr. Eisenberg. What is the magnification, Mr. Frazier?
Mr. Frazier. Approximately 100 diameters.
Mr. Eisenberg. And is that magnification equal on both sides of the picture?
Mr. Frazier. Yes, sir.
Mr. Eisenberg. Did you make your identification of Exhibit 543, that is the identification of that exhibit as having been fired in the rifle 139, on the basis of your examination under the microscope, or on the basis of the photograph?
Mr. Frazier. Under the microscope. The photograph has no relationship whatsoever to the examination.
Mr. Eisenberg. Can you explain that?
Mr. Frazier. The examination is made microscopically through the use of your eyes, and your eyes will record depths and shapes to a much greater extent than can be shown in a photograph. So that the examination and comparison is made of these irregular surfaces mentally, rather than mechanically by any means. The photograph is taken primarily to illustrate the types of marks found and their location, relatively, on the specimen.