Unpublished paper, 'Experiments to determine the quantity of light reflected by plane metallic specula under different angles of incidence; with a description of the photometer made use of' by Richard Potter Potter recounts his experiments on plane specula that he created himself, seeking to assess the quantity of light reflected by his specula. He also describes the design and construction of the photometer used in his experiments. Includes one separate page of figures. Subject: Optics / Scientific Instruments Communicated by the President [Davies Gilbert]. Read to the Royal Society on 25 March 1830. Whilst the Royal Society declined to publish this paper, it was published in full in the Edinburgh Journal of Science: Potter, Richard. 'An Account of Experiments to Determine the Quantity of Light Reflected by Plane Metallic Specula Under Different Angles of Incidence: With a Description of the Photometer Made Use of.' Edinburgh Journal of Science, vol 3, 1830, pp 278-288. [1830]