A periscope being used above an operation which is projected onto a lantern screen for a lecture in the adjoining room. Gouache painting by W.R. Seton.

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Credit

A periscope being used above an operation which is projected onto a lantern screen for a lecture in the adjoining room. Gouache painting by W.R. Seton. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.