Abstract
IN NATURE, vol. xxiii. p. 244, Mr. Edwin Clark gives a method whereby the height or distance of clouds may be measured. This end has already been attained by me, several years ago, and I believe with adequate success. I have also worked out the method in detail, so that its practical realisation no longer offers any difficulty. It is very simple and easy, and the apparatus (“nephoscope”) is not difficult to make. A full description of the nephoscope will be found in the Zeitschrift der Oesterreich. Ges. fur Meteorologie, edited by Jelinek and Hann, vol. ii. p. 337, in so far as the instrument serves for measuring the direction and velocity of the passage of clouds. In order also to ascertain the absolute height of clouds (N.B. all without calculation) I have introduced an improvement. This and a guide to practical use I have published in the same Zeitschrift (vol. ix. September, 1874, pp. 257–61). I believe Mr. Edwin Clark will find in the article referred to his idea fully worked out.
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