Plan, cross-section and elevation of the trestle on which to work on a block of marble. Engraving by R. Bénard after Bourgeois.

Licence: Public Domain Mark

Credit: Plan, cross-section and elevation of the trestle on which to work on a block of marble. Engraving by R. Bénard after Bourgeois. Wellcome Collection. Source: Wellcome Collection.