A colorimeter comprising a light source, an operational amplifier, a
reference photoconductive cell connected between the input and output of
the amplifier and a sample photoconductive cell connected to the input
of the amplifier. The amplifier provides an output signal which is a
function of the ratio of the amount of light falling on the reference
photoconductive cell to the amount of light falling on the sample
photoconductive cell. The output of the amplifier is connected to a
suitable measuring device such as a meter or recorder which provides a
measurement of the output signal.
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