TY - JOUR
AU1 - Riggenbach, A.
AB - 16 ~GGENBACH--ME'$HOD OF PHOTOGRAPHING OIRRUS CLOUDS. ON A METHOD OF PHOTOGRAPHING CIRRUS CLOUDS, BY DR. A. RIGGENBACH. (Communicated by R. H. SCOTT, M.A., F.R.S., Foreign Secretary.) [Received November 19th. -Read November 21st, lS8S.l GREAT difficulty is experienced in obtaining photographs of cirrus clouds, owing to the factathat the blue light of the sky acts with ncnrly the samc actinic energy as the white light of the clouds on thc scnsitivo silvw salts of the plate. If any plan could be devised for dulling this blue light of the sky whilo the light of the clouds was left unaffected, the clouds would stand out from the comparatively dark background of the sky in the photographic picture, just as they do in the images formed by our eyes, The asalyser of any polarising apparatus will effect this object. The light from the blue sky is partly polarised, and to the largest extent at the points which are situated 90° from the sun; the plane of polarisation passing through the points looked at, the sun, and the eye of the observer. On the other hand, the light coming from a cloud h only polarised to slight extent. Let us now take a 
TI - On a method of photographing cirrus clouds
JF - The Quarterly Journal of the Royal Meteorological Society
DO - 10.1002/qj.4970156903
DA - 1889-01-01
UR - https://www.deepdyve.com/lp/wiley/on-a-method-of-photographing-cirrus-clouds-mQJ4A12Z9B
SP - 16
EP - 17
VL - 15
IS - 69
DP - DeepDyve
ER -