Bubbles Give Ice-Free Port
Russia’s endless quest for an> icefree port may have been solved, without need for territorial expansion, by a Swedish invention on which a United States patent has just been issued. If it works out as described, it would make ice-free ports of Leningrad or Vladivostok.
The invention is the work of Bengt O. E. Perssdn, of Enebyberg, and Erik Eorslind, of Stockholm. It consists simply of long lines of perforated pipes laid under the channel to be kept ice-free. Air is pumped through the pipes. As the bubblesrise in from the perforations they pull currents of water upward along with them. This water, which is above thawing temperature, displaces the thin stratum of cold water immediately under the ice, and proceeds to melt a clear channel. /
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https://paperspast.natlib.govt.nz/newspapers/BPB19481210.2.30
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Bay of Plenty Beacon, Volume 13, Issue 31, 10 December 1948, Page 6
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130Bubbles Give Ice-Free Port Bay of Plenty Beacon, Volume 13, Issue 31, 10 December 1948, Page 6
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