Abstract
THERE are one or two points, particularly in the substage arrangements, which are distinct and characteristic of English and Continental microscopes. In the English instrument of any pretensions it has always been the custom to provide a centring substage, and this carries both the optical portion of the substage condenser and the iris diaphragm. It has to be assumed, therefore, that the iris diaphragm is centred permanently and accurately to the optic axis of the substage condenser, its perfection therefore depending on the extent to which this assumption is justified.
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The Microscope Substance and its Adjustments . Nature 91, 435 (1913). https://doi.org/10.1038/091435a0
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DOI: https://doi.org/10.1038/091435a0