sund-helm, m.n: a water-covering, the sea which covers.
Image from one of my favourite tumblr blogs, discarding images: ‘medieval snorkeling’ – Konrad Kyeser, Bellifortis, Bavaria 1459. København, Det Kongelige Bibliotek, Thott 290 2º, fol. 45r.
I first learned about Kyeser at the International Medieval Congress 2013. I talk about the medieval sci-fi panel I attended on my other blog. At this panel Alison Harthill (Cardiff) presented her paper ‘Dreams of War, Dreams of Dragons’ Fire: Conrad Kyeser’s Bellifortis’.