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Rob you are right it is only by finding it in his works that this will be solved.
The question is which work.
Dating it is potentially the easiest... in his 1847 publication he discusses how the bright star in Argos went ballistic becoming the second brightest star in the heavens. This event seems to have altered the keyhole nebula so that now it really does not look like one.
So somewhere between 1830 and 47 is where it would be found.
Lemniscate is indeed the infinity sign shape but to some of us that could easily look like a keyhole for an old fashioned (make that modern for H2) key.
Brian
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