On the determination of the Photometric Intensity of the Coronal Light during the Solar Eclipse of April 16th, 1893. Received April 14, - Read April 30, 1896.

(London, Harrison and Sons, 1897). 4to. No wrappers as extracted from ""Philosophical Transactions"" Year 1896, Volume 187 - Series A. Pp. 433-442.

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First printing. Abney was a pioneer in the sensitometry of photographic images, and inventor of a dry photographic emulsion. His ""Instruction in Photography"", 1871 became a standard text.