PHOTOGRAPHS 



Cloud photographs to iUustrate the various code specifications are 

 shown on the succeeding pages. The pictures are accompanied by 

 descriptions which indicate briefly the reasons for the code figures 

 assigned. Observers should not rely solely on these pictures and 

 accompanying descriptions in coding cloud observations. All of 

 the definitions, descriptions, and code specifications in the preceding 

 pages must be studied and the criteria for distinguishing the various 

 cloud forms and coding classifications must be memorized. Observers 

 must be able to prepare coded messages quickly and without searching 

 specifications and cloud pictures at time of observation. 



Illustrations in the International Atlas should also be studied 

 carefully by all observers who have access to it. 



The cloud photographs reproduced here have been obtained from 

 various sources. Many of them were selected from the Weather 

 Bureau collection to which many individuals have contributed. The 

 following persons furnished photographs especially for use in illus- 

 trating code specifications: Dr. Charles F. Brooks, Dr. W, J. Hum- 

 phreys, Mr. H. T. Floreen, and the Reverend C. E. Deppermann, S. J. 

 Photographs used for plates 61, 62, and 63 were taken by Mrs. Lois 

 Bowen (T. W. A., Inc.) and photographs for plates 66, 69, and 70 were 

 taken by the National Advisory Committee for Aeronautics through 

 courtesy of Pan American Airways. 



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