Similar methods using other media Message in a bottle
the term message in bottle has been applied techniques of communication not literally involve bottle or water transmission medium, such pioneer plaque (1972, 1973), voyager golden record (1977), , radio-borne messages (see cosmic call, teen age message, message earth), directed space.
balloon mail involves sending undirected messages through air rather bodies of water. example, during prussian siege of paris in 1870, letters sent hot air balloon, way communications besieged city reach rest of france.
stationary time capsules have been termed messages in bottle, such 1935 message in lemonade bottle correctly portending difficult times, found in 2016 masons restoring damaged portland stone @ southampton guildhall. geologist left bottled message in 1959 in cairn on isolated ward hunt island (canada, 83°n latitude), allowing finders in 2013 determine nearby glacier had retreated on 200 feet in intervening 54 years. more durable examples of time capsules westinghouse time capsules of 1939 , 1964 new york world s fairs, intended opened 5,000 years after creation.
prisoners auschwitz concentration camp concealed bottles containing sketches , writings
that found after world war ii.
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