Anatomical manipulation, or, The methods of pursuing practical investigations in comparative anatomy and physiology : also an introduction to the use of the microscope, etc., and appendix (1844)
Tulk, Alfred, d. 1891, Henfrey, Arthur, 1819-1859 · London : Van Voorst · leaf 116
ofthe eye in each individual. Now when we place a con-vex lens between the eye and the object, this lensreceives those divergent rays which would be otherwiselost, and refracts them so that they are conveyed tothe retina, as is shown in fig. 32; the rays, after re-fraction, assume the direction of… … magnifying power, and evidently depends upon the focallength of the lens, the object A B being placed nearly inits principal focus. The 10 inch standard has another advantage in prac-tice, as a cipher added to the denomination of the frac-tion denoting the focal length of a lens, will give…
Anatomy, Comparative · Dissection · Microscopy
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