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Micro-spec′tro-scope.

A spectroscope placed in connection with a microscope, in order that the absorption lines may be the more accurately measured. The eye-piece contains prisms so placed as to enable the reflected ray to pass in a direct line to the eye. a is the first lens of the eye-piece; b the screw for adjusting the slit which reduces the beam to a line of light; c is the second lens, where the rays [1436] are rendered parallel, after which they pass through three crown-glass prisms m, placed in one direction, and two flint-glass prisms, placed in the other direction, so that the spectrum is seen by looking straight at the source of light, the instrument being a directvision spectroscope.

The instrument is notably employed in viewing the absorption bands of blood in toxicological research. By means of the mirror d, a ray of light, shown by the dotted line, may be sent through a slit at one side of the instrument, which, being reflected upward, passes through the prisms along with the other light which came from the object under the microscope, and by this means the two spectra may be compared, one object being a liquid supposed to be blood, and the other one known to be blood, and so on.

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