Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 126
hown in fig.79. The lamp being placed in front of the instrument, the twoapertures admit similar pencils of light from it, so that each eyereceives a completely equal illumination, and no confusion can occurfrom the impinging of the rays on the lower edges of the prisms.With this arrangement the… … Fig. 79. 102 VISION WITH THE COMPOUND MICROSCOPE 1! IIS •••l.^-H^^X . , ;--c-\ • . <}. ; .IB. ■ Fig. 80. -Stephensons erectingprism. But one of the greatest advantages attendant on Mr. Stephen-sons construction is its capability of being combined with anerecting arrangement, which renders it…
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