Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 83
33 OPTICAL PRINCIPLES OF THE MICROSCOPE. … Double Stop for Stephenson Binocular. Fro. 25. Fig. 24. as shown in Fig. 24. The lamp being placed in frontof the instmment, the twoapertures admit similarpencils of light from it; sothat each eye receives acompletely equal illumina-tion, and no confusion canoccur from the impingingof the rays on…
Microscopy · Biology
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