. The microscope and its revelations. ensable, but thismay be varied. There are ordinary and special eye-pieces. Thosein ordinary use separate into two divisions : (1) positive eye-piecesand (2) negative eye-pieces. These are easily distinguished; witha positive eye-piece we can obtain, a virtual image of an object byusing it as a simple microscope, because its focus is exterior to cannot be done with the negative eye-piece, because its focus iswithin itself. The eye-piece in common use is negative, and is generally knownas Huyghenss, and sometimes as Campanis. Monconys appeals toh
. The microscope and its revelations. ensable, but thismay be varied. There are ordinary and special eye-pieces. Thosein ordinary use separate into two divisions : (1) positive eye-piecesand (2) negative eye-pieces. These are easily distinguished; witha positive eye-piece we can obtain, a virtual image of an object byusing it as a simple microscope, because its focus is exterior to cannot be done with the negative eye-piece, because its focus iswithin itself. The eye-piece in common use is negative, and is generally knownas Huyghenss, and sometimes as Campanis. Monconys appeals tohave been the first (1665) to supply the field-lens to the eye-lens ofthe microscope, and Hooke in 1665 adopted his suggestion ; buthow far Monconys was indebted for this to the compound eye-pieceattributed to Huyghens cannot now be determined. This instrument, as commonly used in a telescope, consists ofan eye-lens and a field-lens, each being plano-convex, having theirconvex sides towards the object, their foci being in the ratio of.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
