Welcome Comparison-Microscopes
It consists of two microscopes connected to an optical bridge that results in a split view window. A device used to analyze side-by-side specimens is called a comparison microscope or also known as stereo microscope or dissecting microscope. The comparison microscope is used in forensic sciences to be able to compare microscope patterns and identify or deny their common origin. Handguns predominated as the firearm of choices in shooting-related crimes, especially in the United States of America. The fired ammunition components may acquire sufficient unique and reproducible microscopic marks to be identifiable as having been fired by a single firearm.
The two microscopes that are placed next to each other and the optical paths of each microscope that are connected together by the optical bridge would help the forensic examiners to simultaneously compare two specimens instead of depending their memory are the simple idea behind the comparison microscope. Making this comparison is correctly referred to as firearms identification, or sometimes called as ballistics. The traditional tool of the firearms examiner has been what is often called the ballistic comparison microscope. Comparison microscope is essential for the forensic ballistic expert in comparing bullets and spent cartridge casings.
The interior of a gun’s barrel is machined to have grooves that force the bullet to rotate as it travels along it. The forensic discipline ultimately requires a microscopic side-by-side comparison of fired bullets or cartridge cases, one pair at a time, by a forensic examiner to confirm or possibly eliminate the two items as having been fired by a single firearm. These grooves and their counterpart, called lands imprint groove and land impressions on the surface of the bullet. Imperfections on the barrel surface are incidentally transferred to the bullet’s surface. Since these imperfections are randomly generated, during manufacture or due to use, they are unique to each barrel. These patterns or imperfections amounts to a signature that each barrel imprints on each of the bullets fired through it.
It is this signature on the bullets imparted due to the unique imperfections on the barrel that enable the validation and identification of bullets as having originated from a particular gun. Used to analyze the matching of the microscopic impressions found on the surface of bullets and a casing is the comparison microscope. Forensic examiners compare the ballistic fingerprint of the recovered bullet or cartridge case with the ballistic fingerprint of second bullet or cartridge case test fired from the recovered firearm is when a firearm or a bullet or cartridge case are recovered from crime scene.
A link between a specific firearm and a bullet or cartridge case recovered from a crime scene constitutes a valuable lead, since investigators may be able to connect the firearm to a person, who may then become either a suspect or a source of information helpful to the investigation. If the ballistic fingerprint on the test fired bullet or cartridge case matches the ballistic fingerprint on the recovered bullet or cartridge case matches the recovered bullet or cartridge case was also fired from the recovered gun.
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