Summary
a simple method of making a large inexpensive monochromatic filter to isolate the 5461 Å mercury green line is given. The filter consists of a glass cell of suitable thickness filled with a solution of didymium, copper and potassium salts in proper proportions.
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Reference
Roberts, E. J., Am. Jnl. Sci., 31, 350 (1911).
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formerly an Institute Fellow, Department of Aeronautical Engineering, Indian Institute of Science, Bangalore
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Navaratna, D.R. Monochromatic filter for 5461 Å green. Experimental Mechanics 2, 191–192 (1962). https://doi.org/10.1007/BF02325790
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DOI: https://doi.org/10.1007/BF02325790