Direct vision spectroscope by A. Hilger
- maker:
- Adam Hilger
Direct vision spectroscope by A. Hilger , London, c.1900. Contains two "half prisms" rotated by micrometer, screw of 100 threads to the inch, drum divided into 100 parts
Direct vision spectroscope by A. Hilger , London, c.1900. Contains two "half prisms" rotated by micrometer, screw of 100 threads to the inch, drum divided into 100 parts