Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 266
, with such a screen ofcoloured glass as may be found needful, and the lamp illuminatingthe paper and pencil, and carefully shaded above, is also seen at theeye-piece end of the body-tube. Often, if the image is too bright,we find that bringing the lamp down to illuminate the paper moreintensely… … HOW TO DETERMINE MAGNIFYING POWER 239 the reason given above, Beales neutral tint camera 1 is eminentlysuitable—indeed, is the best. We can easily and accuratelv measurethe path of the ray from the paper to the eye. What is necessary isto project the image of a stage micrometer on to an accurat…
Microscopy
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