Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 308
calstage or to the body, as is sooften done. If it is fixed tothe mechanical stage, whenthe object is moved the lightwill require to be readjusted,to say nothing of the probableinjury to the stage by theweight of the bulls-eye. If itis fixed to the body the lightwill be displaced when thefocus of… … Fig. 233.—The bulls-eye. the side of it turned towards the light and the condition of the rayswhich fall upon it. The position of least spherical aberration is whenits convex side is turned t owards pa rallel or towards the least divergingrays, consequently, when used by daylight, its plane side…
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