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Updated: May 11, 2025
"Thank you; I have a pretty good one of my own," Tom answered, diving into one of his pockets and bringing to light a small but powerful reading glass with an aplanatic lens. "You carry a better magnifier than I do," laughed Rutter. "Hazelton, do You carry a pocket glass?" "Yes, sir," nodded Harry "I have one just like Reade's." "Good! I can see that you youngsters believe in good tools."
It was thought that the use of this Herschel aplanatic combination as an eyepiece, combined with the Wollaston doublet for the objective, came as near perfection as the compound microscope was likely soon to come.
Sir John Herschel, another of the very great physicists of the time, also gave attention to the problem of improving the microscope, and in 1821 he introduced what was called an aplanatic combination of lenses, in which, as the name implies, the spherical aberration was largely done away with.
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