 | Isaac Ott - 1904 - 582 pages
...achromatic eyelens. C, milled head, with screw motion to open and shut slit vertically Another screw, //, at right angles to C, regulates the slit horizontally....once recognized cannot be mistaken for the other. D, D, an apparatus for holding CD a small tube, that the spectrum given by its contents may be compared... | |
 | Isaac Ott - 1907 - 852 pages
...adjust finally the focus of the achromatic eyelens. C, milled head, with screw motion to open and shut slit vertically. Another screw, H, at right angles...once recognized cannot be mistaken for the other. D, D, an apparatus for holding a small tube, that the spectrum given by its contents may be compared... | |
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DD, an apparatus for holding a small tube, that the spectrum given by its contents may be compared with that from any other object on the stage. 
