 Below the prism is an achromatic eye-piece, having an adjustable slit between the two lenses, the upper lens being furnished with a screw motion to focus the slit. A side slit, capable of adjustment, admits, when required, a second beam of light from...  Spectrum analysis, 6 lects - Page 219by sir Henry Enfield Roscoe - 1873Full view - About this book
 | Isaac Ott - 1907 - 852 pages
...consists of several parts. The prism is contained in a small tube, which can be removed at pleasure. Below the prism is an achromatic eyepiece, having...field with that obtained from the object on the stage. A is a brass tube carrying the compound direct-vision prism, and has a sliding arrangement for roughly... | |
 | Jabez Hogg - 1911 - 780 pages
...prism is an achromatic eye-piece, having an adjustable slit between the two lenses, the upper Ions being furnished with a screw motion to focus the slit....the object placed on the stage of the microscope. Fig. 195.— The Sorhy-TSrowninf; Micro-spectroscopic Eye-piece. This second beam of light strikes... | |
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