This is based on Byrne's famous translation/illustration of Euclid published in the 1840s, which did use the long s (although it was beginning to fall out of fa

This is based on Byrne's famous translation/illustration of Euclid published in the 1840s, which did use the long s (although it was beginning to fall out of favor even then) See this example page from the book https://www.mccunecollection.org/gems https://www.mccunecollection.org/gems