Manual of Marine Meteorological Observations, Ninth edition, Change No. 1
U.S. Weather Bureau
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Change #1 to Circular M consists of the attached page changes; i.e., pages v-vi, 3-6, 27-30, 39-40, 47-54, 67-68 and 71-86. These changes are effective January 1, 1955, as indicated at the top o'£ each page in which changes were made. As a. further aid in identification, an asterisk has been placed in the left margin at the beginning of sections, paragraphs, lines, tables, etc., in which changes were made. In summary, the changes pertain to the fallowing: 1. Use of the symbol "X" in coding, wherever a. slant ( /) was used in the past. 2. Changes in Code Table 6, Symbol ww - Present Weather (mostly of a clarifying nature) 3. Changes in the definitions of code figures 0, 1 and 2 of Code Table 7, Symbol W - Past Weather. 4. Changes in the meaning of code figures in Code Table 15, Symbol a. - Barometer change characteristic in the last 3 hours. 5. Change in the meaning of Symbol Nh - See Par . 8320 and Code Table 3. 6. Change in the meaning of Symbol h - See Par . 8330 and Code Tab.....
PublisherGovernment Printing Office