| No. 75. | The Micro-Spectroscope fits into the tube of the microscope
like any ordinary eye-piece and may be fixed
in any desired position by means of the thumb-screw
M. The position of the bright and dark lines
of the spectrum and their respective wave lengths are
ascertained by means of a scale. The flat drum A,
the interior of which is shown in section, contains the
slit and the comparison prism. The slit is regulated
by the screws F and H. The lever T moves the
comparison prism across one half of the slit. The
cylinder Q above the eye-piece contains the Amici
prism. At the point N of the horizontal tube RN is
the micrometer scale, illuminated by the mirror O.
After raising the spring-catch L the upper part of the
spectroscope may be turned round the pivot K, thus
allowing of the adjustment of the eye-piece | $66.— |
