London, W. Bulmer and Co., 1820. 4to. No wrappers as extracted from ""Philosophical Transactions"" 1820 - Part I. Pp. 45-100 a. 1 engraved plate.
Reference : 49743
First printing of one of herschel's importent investigations on polarization and the wave theory of light. He designed a new instrument to project the colored rings onto a screen about three inches behind the analyzer. This method allowed Herschel to examine the details of the tints.
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