Alexander Graham Bell's Kite
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Alexander Graham Bell and 4 assistants observing the progress of one of his large ring shaped tetrahedral kites, in a grassy field 1908.
Alexander Graham Bell (right) and his assistants observing the progress of one of his tetrahedral kites, 1908.
Good stuff at source: https://publicdomainreview.org/collecti...
Good stuff at source: https://publicdomainreview.org/collecti...
doesn’t look tetrahedral.