Comparative microscope
A comparison microscope is a microscope with which two objects or samples can be viewed at the same time and thus compared. The first idea for a comparison microscope was published in 1885 by the Russian geologist Alexander Alexandrovich Inostranzew . The constructive suggestions of the Osnabrück chemist Wilhelm Thörner led in 1911 to the presentation of the first commercially available comparison microscope by Wilhelm & Heinrich Seibert , Wetzlar.
Later, the comparison microscope was mainly used in forensic ballistics . It was conceived for this application (1925) and developed (1927) by the chemist Philipp O. Gravelle and the doctor Calvin Goddard, in order to find out whether two bullets were fired from a weapon or what type of weapon was used. This is possible because every weapon leaves characteristic marks on the bullets due to the firing mechanism and barrel .
Web links
- First commercially available comparative microscope , manufactured by W. & H. Seibert in Wetzlar, 1915
- Comparison eyepiece , manufactured by Carl Zeiss Jena in 1925