A split-field photo of two cartridge casings through the lens of firearm examiner Michael Haag’s comparison microscope. Haag said he determined the cartridge casing on the left, recovered as ...

A split-field photo of two bullets through the lens of firearm examiner Michael Haag's comparison microscope. After looking at the marks on the bullets, including the scratch-like lines, or ...

Melland, a BCA forensic scientist, says a comparison microscope is used to figure out the rest. "This one is our test specimen on the left, this would be our evidence specimen on the right and ...

The microscope allows them to line up different areas to see them next to each other as well as take pictures. Those pictures, however, are not intended to be used to make a match determination.

But a match is only confirmed when examiners compare casings using a comparison microscope — an important distinction when thinking about admissible evidence in court cases. ...

This article was originally published with the title “ A Comparison Microscope, The Mono-rail Sled, and more ” in Scientific American Magazine Vol. 108 No. 7 (February 1913), p. 158 doi:10. ...