pp 17–18:

M. Van Swinden is the only person who has placed on record the observation of the dark lines, or threads, which connect the borders of the sun and moon, at the formation and dissolution of the annulus. His account is inserted in the first volume of the Memoirs of this Society (page 146), accompanied with drawings, which coincide almost exactly with those given by Mr. Baily.

It's tricky enough† to get a hold of Memoirs volume 1, but even after finding a copy, the only thing I can see in the vicinity of page 146 is Van Swinden's account, not the drawings.

† I couldn't find a full copy last time I tried in 2017, even though I spent a few hours reasoning at the time that surely I'd be able to turn something up...