A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures (1848)
Quekett, John, 1815-1861 · London, H. Bailliere · leaf 186
ed, whilst the spherical hasbeen considerably diminished by the circumstance that theside of the pencil which passes one lens nearest the axis,passes the other nearest the margin. But however carefullya doublet of this form may be constructed, there must ofnecessity be some small amount of error;… … 146 PRACTICAL TREATISE ON THE MICROSCOPE. vary according to their distance from one or the other; butallowing this, the doublet is nevertheless vastly superior toany single lens of the same power, and may be made totransmit a pencil of an angle from 35° to 50°, without anyvery sensible errors, and…
Microscopy
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