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The comparison microscope was invented by Philip Gravelle. Gravelle was a chemist, and his comparison microscope was used to identify bullets and cartridge cases by a pioneer in ballistics, Calvin Goddard.
lists the advantages and disadvantages of the compaund and stereoscopic microscope
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Calvin Goddard established the comparison microscope as the indispensable tool of the modern firearms examiner.
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Comparison microscope
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A comparison microscope is a specialized microscope that has two separate optical systems, allowing for side-by-side comparison of two samples simultaneously. This type of microscope is commonly used in forensics for comparing specimens such as hairs, fibers, or bullets. It helps in identifying similarities or differences between the samples being examined.
A stereo microscope shows two slides side by side at the same time and is used for comparison. A compound microscope only shows one slide.
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A light microscope is advantageous as it is more affordable, widely available, and can observe living specimens. However, it has lower resolution and magnification compared to an electron microscope, limiting its ability to visualize smaller structures in detail. Electron microscopes have higher resolution and magnification capabilities but are more expensive, have limited availability, and can only observe dead specimens due to the high-energy electron beams used.