A printing press with a pair of legs brandishes a quill wrapped around with hissing snakes and sends all those around it flying off. Coloured etching by Paul Pry (William Heath).

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A printing press with a pair of legs brandishes a quill wrapped around with hissing snakes and sends all those around it flying off. Coloured etching by Paul Pry (William Heath). Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.