How to Use the Microscope Being Practical Hints On the Selection And Use of Tha

Cover How to Use the Microscope Being Practical Hints On the Selection And Use of Tha
How to Use the Microscope Being Practical Hints On the Selection And Use of Tha
John Phin
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Take, for example, the podura scale: wide differences of opinion exist as to its structure, and how it ought to look; sup- pose, then, that two objectives show entirely different appear- ances of this object, who shall decide which one is correct ? And if, even in the case of expert microscopists, this holds true absolutely, which it does, how shall a beginner determine that the images which he sees through an objective are true or OF THI3 MIOliOSCOPE. , Sf> false ? In some departments, the mos...t earnest and long-con- tinued discussions have been maintained in regard to the ac- curacy or inaccuracy of certain images as seen by professional microscopists, and, strange to say, these disputes affect the very tests most commonly used, viz. , the Podura scale and the test diatoms.
Makers of objectives, and skilful microscopists, being aware of the fallacies which beset examinations of this kind, resort to certain artificial standards of which the construction is posi- tively known, and which should therefore give appearances conforming to this known structure.


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