Abstract
IN the May issue of Watson's Microscope Record, J. A. Lord pleads for the inclusion of a scale of measurement on each published photomicrograph, so that a visual estimate of the size of the objects represented is readily possible. He also points out the desirability of including such a scale of measurement on lantern slides made from photomicrographs so that, irrespective of initial or final magnifications, the dimensions of the objects can be estimated as seen on the screen. Appended to his article is a convenient form of scale by the aid of which a micro-metric scale, correct for each given magnification, can quickly be marked upon a photograph or a lantern slide.
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Micrometer Scales on Photomicrographs. Nature 133, 905 (1934). https://doi.org/10.1038/133905e0
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DOI: https://doi.org/10.1038/133905e0