Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 84
qual apertures, and equal angles in different media denotedifferent apertures. That immersion objectives may have greater apertures thanthe maximum attainable by a dry objective is capable of equallysimple proof by accessible experiment. If an oil-immersion objective of 122° balsam angle be taken,… … FRONT LENS IMMERSION FL UID| COVER CLASS Fig. 45.—Diagram illustrating difference of emer^in-pencil without and with balsam. haveac//-y object-glass of nearly 180°angular apertuiv. This is readilyseen by fig. 45. By the arrangement presented in the figure the co\ erglass is practically thefirst…
Microscopy
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