looking closer I see the earliest archive.org snapshot of this URL (from Feb 27, 2020, the day it was published) also says 1857 so it seems like the transposition to 1847 must have happened somewhere else - and yet the attribution to SciAm (external to the screenshot) was somehow preserved. @nymnympseudonym@lemmy.world can you shed any light on this mystery? where did you obtain this image (and know to attribute it to SciAm)?