A text-book of physics, largely experimental. On the Harvard college "Descriptive list of elementary physical experiments." (1891)
Hall, Edwin Herbert, 1855-1938, Bergen, Joseph Y. (Joseph Young), 1851-1917 · New York, H. Holt and Company · leaf 231
see that 208 PHYSICS. the magnifying power of a simple microscope is greateras its focal length is less. 187. The Compound Microscope.—For viewing objectsunder any but the lowest magnifying powers, that is, in allcases where the apparent diameter of the image is to beanywhere from 50 to 5000 times… … FIG. 147. single, but generally consisting of two convex lenses, andan objective, II, frequently consisting of from two to sixpieces. These lenses are fixed in a brass tube so arrangedthat the distance between the eye-piece and the objectivecan be vaied at will, within certain limits. A mirror.…
Physics
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