Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 301
entire field is illuminated with anear approach to monochromatic light. The light enters the instru-ment through the slit Sp, which is adjustable m width by the screwS2, and passes through the prisms and the lens at O, forming a spec-trum at Bpk, where the object on the stage is supposed to be… … Fig. 224. but for high powers sunlight must be employed. Moreover in practiceit is needful to use a bulls-eye to focus the light on the slit Bp. Butthis instrument lacks the higher qualities required of it oil account ofthe low angle of the combination 0 which acts as a condenser. Wereally want a…
Microscopy
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