Manuscript, 'Experiments and observations upon the properties of light' by Lord [Henry Peter] Brougham Subject: Physics Published in Philosophical Transactions as 'Experiments and observations upon the properties of light'. Received by the Royal Society on 6 November 1849. Read 10 January 1850. 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 5, 1851. [1849]