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Rams′den's eye-piece.

The positive eye-piece, principally used in micrometers, and invented by Ramsden, a celebrated instrument-maker in England (1735-1800).

His name is associated with science as the maker of the celebrated dividing-engine, and he is known by a number of his instruments, of great accuracy, in several European observatories, — sextants, telescopes, and mural circles.

The Ramsden eye-piece has two plano-convex glasses, each of which presents its concave side to the object-glass. See positive eye-piece.

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