Paper, 'On a periscopic camera obscura and microscope' by Wm [William] Hyde Wollaston Illustrations for this paper have been separated from the manuscript and are found at PT/73/3/4. Subject: Scientific instruments Published in Philosophical Transactions as 'On a periscopic camera obscura and microscope'. Read 11 June 1812. Abstract published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 1, 1832. [1812]