. Discovery. Science. DISCOVERY 133 the loss of light by absorption would be considerable, and allowance would have to be made in constructing the instrument for the displacement of the images by refraction. These were the defects which prevented the further development of the chromoscope and its application to uses other than that for which it was originally devised ; and, indeed, it seemed likely that the chromo- scope would remain exclusively at the service of colour photography. Quite recently, however, Messrs. Adam Hilger, in the course of cunning research in optical fields of science, di
. Discovery. Science. DISCOVERY 133 the loss of light by absorption would be considerable, and allowance would have to be made in constructing the instrument for the displacement of the images by refraction. These were the defects which prevented the further development of the chromoscope and its application to uses other than that for which it was originally devised ; and, indeed, it seemed likely that the chromo- scope would remain exclusively at the service of colour photography. Quite recently, however, Messrs. Adam Hilger, in the course of cunning research in optical fields of science, discovered that an extremely thin and tightly stretched film of celluloid served equally well as, in fact much better than, glass as a transparent reflector. Of a thickness little greater than the wave-length of visible light, its sensitivity was put to use in their optical synometer and various other instruments of Adam Hilger design. All the defects inseparable from the emplojTnent of glass mirrors were now eradicated. But it was not until Adrian Bernard Klein, artist and colour physicist, turned his mind to this discovery that its application to the chromoscope came to light. Adrian Klein, skilled in the matching and the music j of colour, knew the defects of the chromoscope ; and, not slow to grasp the corresponding significance of optical celluloid, caused a ten-picture instrument to i be built. In this instrument he made use of ten celluloid mirrors in which the formation of secondary images was successfully avoided. In this manner the chromoscope was freed from the shadow in which it had lain for sixty years, and its history entirely changed. New Developments An instrument enabling all sorts of coloured designs to be viewed immediately in any desired colour com- bination, the chromoscope now enters an indefinitely enlarged sphere of usefulness. It is called the " Im- proved Chromoscope," and its province, far from being hmited to three-colour photography, covers
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