To perform a version of the experiment of 1800, in which a form of radiation other than visible light was discovered by the famous astronomer Sir Frederick William Herschel. Experiment Set-Up: Place a sheet of white paper inside a cardboard box; Tape three thermometers together and place inside box. Cut a small notch in the top of the box and position a small glass prism so that the spectrum is projected inside the box. Arrange the thermometers so that one is just outside the red end of the spectrum, with no visible light falling on it. Result: The thermometers will register differences almost immediately.