Abstract
MESSRS. ADAM HILGER, Ltd., have forwarded to us some interesting leaflets on recent developments in spectrographic apparatus. The alignment or collimation of the light source with the axis of the collimator is of great importance when any quantitative measurements of a photometric character have to be made. Several of the spectrographs are now constructed with an accessory bar the axis of which is strictly parallel to that of the collimator. Photometer lenses and even light sources can be mounted on this ‘optical bench’, and the dangers of imperfect collimation are much reduced. When these instruments are used in routine testing, the time saved can be very considerable.
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W., W. New Spectrographic Apparatus. Nature 137, 244–245 (1936). https://doi.org/10.1038/137244a0
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DOI: https://doi.org/10.1038/137244a0
