Microscopical Praxis; Or, Simple Methods of Ascertaining the Properties of Various Microscopical Accessories
The book Microscopical Praxis; Or, Simple Methods of Ascertaining the Properties of Various Microscopical Accessories was written by author Alfred C Alfred Cheatham Stokes Here you can read free online of Microscopical Praxis; Or, Simple Methods of Ascertaining the Properties of Various Microscopical Accessories book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Microscopical Praxis; Or, Simple Methods of Ascertaining the Properties of Various Microscopical Accessories a good or bad book?
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It is exceedingly important to know the thickness of the cover when using non-adjustable objectives. These lenses are corrected by their makers for a certain thick- ness, and as the adjustment cannot be changed, and since the microscopist, until recently, has not known for what cover-thickness the objectives were intended, he was at the mercy of circumstances, and forced to ac- cept and be content with whatever image he could get. Now we are able to use covers of at least approximate correctnes...s with our non-adjustable objectives, thanks to Prof. S. H. Gage, of Cornell Universitj', who has in- vestigated the matter. Prof. Gage submitted certain questions in relation to the subject to the various opti- cians of the world, and from his published results I take the following, so that the reader, if he possess non-adjustable objectives by any of these makers, may use covers of the proper thickness to obtain the best results, provided his microscope body-tube is of the standard length. I J.
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