![]() Many microscopes were sold in wooden boxes with serial numbers on them and. Product Details Used Leitz Wetzlar Microscope (1) Microscope Includes L20/0.32, 10/0.25, 32/0.40 Objectives Includes Metal Microscope Slide Includes Phaco A 0.25 L62. A date of 1890 or so would seem about right. Ernst Leitz of Germany and Parisian Camille Sebastien Nachet made quality. Leitz GmbH Wetzlar) is one of the greatest names in microscopy.2 Today. This example has part of its wooden case and was supplied by Watson and Sons, which helps date it Watson became ‘and Sons’ in 1883 and later ‘and Sons Ltd’ in 1903. A reference to an extensive list of serial numbers of Leitz microscopes was. Maltwood passed his scale onto the microscope manufacturers Smith & Beck of London, who photographed it and subsequently produced the hand numbered Maltwood Finder slides. Starting with a piece of paper that was ten inches squared, Maltwood painstakingly divided this into 1/50th inch squares and wrote latitudinal and longitudinal coordinates in each 1/5th square inch (a total of 38,400 numbers!). A friend of Maltwood suggested that he draw a larger scale which could then be photographed with the negatives scaled down and printed onto glass squares. Unfortunately, ruling lines at such a small scale proved to be too difficult for accurately finding positions at a high magnification. ![]() In his account, he describes an initial attempt to draw a grid onto paper that was stuck to a glass slide. ![]() One of the earliest references to a finder slide dates back to 1858 and was invented by Thomas Maltwood, who published his work in the Transactions of the Microscopical Society of London.
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