comparison microscope


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comparison microscope

[kəm′par·ə·sən ′mī·krə‚skōp]
(optics)
An arrangement of two microscopes connected by a special receiving ocular so that the field of one microscope is seen at one side of a dividing line and the field of the other microscope at the opposite side.
A projection type of microscope in which the image is compared with a template or known pattern.
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References in periodicals archive ?
Along with key cases, he details such techniques as Alphonse Bertillon's program of physical measurements used to recognize habitual criminals; the study of fingerprints; Phillip Gravelle's comparison microscope for examining bullets; the development of bloodstain identification; and recent advances in DNA typing techniques, blood-spatter analysis, and face-pattern recognition.
Jefferson received a grant that paid for the comparison microscope the class uses.
In this stage, a trained firearm-toolmark examiner using a specially designed comparison microscope determines if sufficient agreement of features (usually scratch marks or striations) exists to conclude that a bullet was fired from a particular firearm.
However, courts don't accept as evidence the results of an automated search without verification by a firearms examiner looking at the actual bullets or cases with a comparison microscope.
Then, by properly focusing the instrument and moving the bullets or shells into their correct positions, the comparison microscope will transmit the fusion of both fatal and test bullets or shells.
Although the technology was primitive in 1921, by 1927 the comparison microscope was in use, and in tests made in that year and again in 1935, 1961 and 1983, it was shown that one bullet taken from the body of the dying payroll guard had been fired from Sacco's Colt pistol.
Tenders are invited for Purchasing one (1) Leeds Model LCF3 Forensic firearm comparison microscope or equivalent unit plus all parts, delivery, installation, calibration and one year warranty.
The comparison process involves the side-by-side analysis of a questioned hair and known hair samples using a comparison microscope.
Tenders are invited for Forensic Firearm Comparison Microscope III
The use of a high-quality transmitted light comparison microscope is mandatory when comparing the microscopical characteristics of hairs.

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