Diagram, experimental equipment by John Conroy A diagram of the setup used by Conroy in his investigations into the amount of light reflected by metallic surfaces, including two triangular prisms enclosed in a box with three apertures. Subject: Optics / Scientific apparatus and equipment Received 1 November 1882. Read 15 February 1882. Communicated by George Gabriel Stokes. A print of this diagram was published in volume 35 of the Proceedings of the Royal Society alongside the paper 'Some experiments on metallic reflection. No. III. On the amount of light reflected by metallic surfaces'. 1882