Abstract
THE appearance of the third edition of “Barnard and Welch” is a very welcome event. Broadly speaking, it follows the plan of its predecessors, except for a number of recent developments which add materially to its value. These are concerned with the application of infra-red radiation to microscopy, and an extended technique suitable for opaque objects. In this latter connexion one would have been glad to see some specific reference to recent work on the photomicrography of polished minerals and ores by polarized light, such as has achieved considerable success both at Cambridge and on the Continent. In metallurgical practice, the tendency to forget that magnification exerts little influence upon exposure times (due to the self-condensing action of the objective) is specially mentioned a most valuable reminder. Again, the photo-micrography of mercury droplets as a method of perfect centration is a very elegant device, beautifully illustrated for both ordinary and dark-ground illumination. As the authors remark, skill and long experience are more important than complex equipment. That is the conclusion which many workers in this field have reached, encouraged maybe by the guidance of “Practical Photo-Micrography”.
Practical Photo-Micrography
By J. E. Barnard Frank V. Welch. Third edition. Pp. xii + 352 + 23 plates. (London: Edward Arnold and Co., 1936.) 21s. net.
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R., F. Technology. Nature 138, 636 (1936). https://doi.org/10.1038/138636e0
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DOI: https://doi.org/10.1038/138636e0