Site is down. This should be the same PDF I think: http://wexler.free.fr/library...

		jval43 10 hours ago \| parent \| context \| favorite \| on: Necker, 1832: "An optical phænomenon on viewing a ... Site is down. This should be the same PDF I think: http://wexler.free.fr/library/files/necker%20(1832)%20observ...
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