This section is from the book "Complete Self-Instructing Library Of Practical Photography", by J. B. Schriever. Also available from Amazon: Complete Self-Instructing Library Of Practical Photography.
Practice Work. After having become fairly familiar with the various types and forms of clouds, make an exposure or two of the best subjects at your command. It may be necessary to watch carefully for a number of days before you are able to obtain any great variety of negatives. In developing sky negatives do not carry them as far as ordinary negatives; they must be crisp and snappy, but not dense.
419. Make good proof prints from each experiment, and place your notations, which will give you full information regarding the manner in which you proceed to secure the results, on the back, and file them in your proof file for future guidance.
STREET SCENE - WINTER. Study No 19 -See Page 312 By JOHN S. NEARY