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'An Act of Grace
George Bellas Greenough (1778-1855)
to reach their homes as there is no bridge
Inscribed: 'Particularitez des corps humain
Ruins of the Bishop of Winchester's palace
Periscopic camera obscura Blondin 'An Act of GracePlate 9 from the paper 'On a periscopic camera obscura and microscope', William Hyde Wollaston, Philosophical Transactions of the Royal Society, vol. 102 (1812), pp. 370 377. Five figures sketching basic optical details of a conventional and periscopic camera obscura, periscopic prism of a camera lucida and a periscopic microscope. The work is inscribed above with publication and plate details. Not signed. Royal Society stamp verso. Watermarked 'Ivy
