LIGHT filters of coloured glass and gelatin are in common use for visual and photoelectric photometers. They are satisfactory, on the whole; but the glass filters are easily broken, and those of ...
King and Ventura 1 have recently directed attention to the value of coloured ‘Perspex’ in the construction of filters for colorimetry, and it may be of interest to describe a similar use to which this ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback