Abstract

ON further examination, the absorption peaks of water recently discussed1 have been found to be inherent in the instrumental technique used. The fall in the values of optical density at the lower wavelengths is the normal stray-light effect under these conditions, but the ‘fine structure’ is now thought to be due to the oxygen absorption in the factory-sealed monochromator and inadequate compensation within the instrument when the slit automatically opens and closes on passing through the wave-lengths at the oxygen absorption peaks.

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