Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 85
olour. Ifthe object-glass had beenrendered perfectly achro-matic, the blue rays, afterpassing through the field-glass, would have beenbrought to a focus at h, and the red at r ; so that an error wouldbe produced, which would have been increased instead of anta-gonised by the eye-glass. Another… … Section of Huyghenian Eye-pieceadapted to over-corrected Achromaticobjectives. CONSTKUCTION OF EYE-PIECES. 63 convex, so that every part of it may be in focus at the sametime, and the field of view thereby rendered flat.* 22. Two or more Huyghenian eye-pieces, of different mag-nifying powers, known…
Microscopy
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