William Doyle, Samuel Sone, and William Foster, walking on the North Bridge in Edinburgh, in uniform, each with a lady. Etching by J. Kay, 1784, after himself.

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William Doyle, Samuel Sone, and William Foster, walking on the North Bridge in Edinburgh, in uniform, each with a lady. Etching by J. Kay, 1784, after himself. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.