(29) Humidity and fog : January mean mixing ratio -- July mean mixing ratio -- Winter mean number of days with fog -- Spring mean number of days with fog -- Summer mean number of days with fog -- Fall mean number of days with fog. Compiled from information supplied by the Meteorological Division, Department of Transport. (Canada Department of Mines and Technical Surveys.)

• Main Authors: Canada. Department of Mines and Technical Surveys, Nicholson, N. L. (Norman Leon), Comtois, Paul
• Format: Map
• Language: unknown
• Published: Department of Mines and Technical Surveys, Geographical Branch 1950
• Subjects: Climate; Weather; Data Visualization; Newfoundland
• Online Access: https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~323202~90092304; https://media.davidrumsey.com/MediaManager/srvr?mediafile=/Size4/RUMSEY~8~1/185/14001064.jpg

6 maps showing humidity and fog in Canada during different seasons. Each map 15 x 32 cm. Each includes a legend. Scale 1:20,000,000 or one inch to 315.6 miles. Lambert Conformal Conic Projection Standard Parallels 49˚N and 77˚N. Descriptive text on verso: Humidity data are obtained from the regular reading of artificially ventilated dry and wet bulb thermometers housed in standard thermometer shelters . The two mixing ratio maps on this plate are based on observations taken at midnight, 6 a.m., noon, and 6 p.m. Greenwich Mean Time over the ten-year period from 1941 to 1950 inclusive . First edition was in 1906 (see our 1645.000); second edition 1915 (1646.000). The title page of this edition is dated 1957 but the Foreword is dated 1958, as well as the maps on plates 91, 99 and 110. Atlas contains 110 plates, comprising a total of 505 maps in color; additionally, these maps include 57 insets. Bound in pale green boards with burgundy lettering and spine, including spine title "Atlas Of Canada. 1957” in gilt. Loose-leaf binding allows both removal and insertion of individual maps. Inside front cover: Canadian made product by Copeland-Chatterson Limited, Brampton, Ontario. In the Foreword, Minister of Mines and Technical Surveys Paul Comtois explains, "Since the last Atlas of Canada appeared in 1915, the economy of Canada has expanded in all directions. The population of the country has doubled. Newfoundland has joined it as the tenth province, and scientific surveys have revealed to an ever increasing extent the physical nature of its land and water resources. It is, therefore, the purpose o this edition of the Atlas to present, in maps, an outline of the physical background and the economic development of the nation at mid-century and to show how these factors are interwoven to produce the fabric of the life of our people … " In the Preface, Director of Department of Mines and Technical Surveys, Geographical Branch, N.L. Nicholson continues, “ … the Atlas provides a logical story in maps which embraces ...