I cannot access the Goucher article cited by Ray, but there is another by her: https://www.jstor.org/stable/25130565 in African Arch. Review 1993. I am hoping to put together a first draft of an article in reply next week. I will need to pass this around for comment. Such an article was the solution that emerged from discussions at Coalbrookdale Museum last weekend.
Ray: can you e-mail me on email@example.com so that I have your contact details. I will want to make use of what you have found out about the Abby’s voyage, with due acknowledgement to you.