Glass: a mediaeval glass-maker at work beside his furnace. Coloured pencil drawing, [n.d., twentieth century], after a thirteenth century French manuscript illustration.

Licence: Public Domain Mark

Credit: Glass: a mediaeval glass-maker at work beside his furnace. Coloured pencil drawing, [n.d., twentieth century], after a thirteenth century French manuscript illustration. Wellcome Collection. Source: Wellcome Collection.