maticlenses, sometimes three, each composed of a convex lens ofcrown glass and a concave one of flint glass, placed in orderand adjusted to give a well-defined magnified real image ofthe object. This is viewed with an eyepiece consisting usuallyof two lenses. 166 LIGHT. [CH. VIII Fig. 116 shews an… … Fig. 116. image of AZB2 formed by the lens 3. It is this real imagewhich is viewed by the eyepiece. #1O2. The Camera Lucida. This instrument shewnin section in fig. 117 consists of a four-sided prism, ABCD, of
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