Excerpt from A Photographic Study of Arc Spectra
The width Of the slit was adjusted by means of a micrometer screw, mm. Being the width ordinarily used. The length of the slit was gauged by means of a diaphragm having a wedge shaped Opening. A frame which held the slit could ... be turned by means of a screw and Spring so as to place the slit accurately par allel to the lines Of the grating.
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