The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)
Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 337
.These then fall on another converging lens, L, of equal focallength, by which they are again made to converge and form asecond image, n m, inverted with respect to the first, but inthe same position as the object. This image is then vicAvedthrough the magnifying lens, M, by the eye at E, as in… … presents a view of the Mounted Spy-glass. C is for the eye-glass or magnifier, in which magnifiers suited to difierent eyesmay be inserted; b is a shade-glass for protecting the eyeagainst the concentrated light from the lens. The great im-provements of late, in the construction of large achromatic…
Physics
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