Diagrams, 'Observations on the radiation of light and heat from bright and black incandescent surfaces' by Mortimer Evans Three graphs, labelled diagrams 1-3, showing the results of Evans' investigations into the radiation of light and heat from bright and black incandescent surfaces. The graphs are marked with watts on the X-axis and candles on the Y-axis. Each graph has a corresponding engraved print. Subject: Optics / Radiation The prints were published in volume 40 of the Proceedings of the Royal Society alongside the paper 'Observations on the radiation of light and heat from bright and black incandescent surfaces'. 1886