CAT NO: DIDACTICNLE-Export-111002
The spectrometer consists of a graduated circle,
generally fixed in a horizontal position, to which is attached a
collimator and a telescope. The collimator consists of a tube containing
an achromatic lens at one end and a vertical slit at the principal
focus of the lens. The movable arm carries an astronomical telescope
which is always directed towards the center of the graduated circle. The
position of the telescope with reference to the fixed circle may be
read by means of a vernier. Above the center of the graduated circle is a
horizontal table, called the table of the spectrometer, which is
capable of rotation about the vertical axis of the circle. The position
of the circle table can be determined by means of the vernier..