Paper, 'Intensity of radiation through turbid media' by [William De Wiveleslie] Abney and [Edward Robert] Festing

Description

Abney and Festing write: 'In the Bakerian Lecture for this year, which was delivered before the Royal Society on March 4th, on Colour Photometry, we gave incidentally the results of some measurements we had made of the intensity of visible radiation which penetrated through a transparent medium as compared with that which penetrated through the same medium rendered turbid. We showed that the formula deduced by Lord Rayleigh from the scattering of light by small particles was confirmed by our experiments. We thought, however, that the theory might be more fully tested if a larger range of spectrum than that to which we had confined ourselves were used, and at the same time it would be more satisfactory if an instrument possessing no personal equation could be utilised. Our thoughts naturally turned to the thermopile, and more particularly to that form which we described in a previous communication to the Royal Society (“Proc. Roy. Soc.,” vol. 37, p. 157, 1884), since its delicacy was extremely great.'

Annotations in pencil and ink.

Subject: Physics / Radiation

Received 3 May 1886. Received 13 May 1886.

A version of this paper was published in volume 40 of the Proceedings of the Royal Society as 'Intensity of radiation through turbid media'.

Reference number

PP/8/26

Earliest possible date

1886

Physical description

Ink and graphite pencil on paper

Page extent

5 pages

Format

Manuscript