Abstract
Summary
Methods are described of using the photo-electric cell, in our case an argon filled bulb, whereby colorimetric and nephelornetric determinations can be made with exceeding accuracy, thus threatening to displace the use of the ordinary Dubcscqe and other similar coorimeters. The diagram indicates one possible set-up of the instrument and one possible hook-up whereby the measurements can lx made. Others can be evolved, as we have determined; in fact, it is possible to measure color by sound after suitably treating the current obtained and passing it through amplifying devices into a loud speaker or a pair of ordinary radio head phones. This should give much finer readings than even by the use of the type R galvanometer which determines 0.000,00025 amperes.
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