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ID number:  BIRRC-P0304
Institution:  Research and Cultural Collections
Named collection:  Historic Physics Collection
Artist / Maker:  Adam Hilger Ltd
Title / Object name:  Spectrometer - constant deviation
Object type:  Optical instrument
Place made:  London
Date made:  1909
Materials:  Lacquered brass tubes on heavy steel base
Measurements:  56 x 58 x 40 cm
BIRRC-P0304.jpg

This optical spectrometer is designed for use with a five-faced Pellin-Broca prism (shown in photo but not included in collection). The collimator and telescope are fixed for a deviation of 90º and the prism is turned by a calibrated micrometer drive to send different wavelengths into the telescope. Between the collimator and the prism is a table turned by a micrometer screw to accommodate an interferometer.

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