Hershel and Ritter

Herschel discovered infrared light when he was observing the sun he noticed that when he put coloured filters over his telescope that different coloured filters heated up his telescope by different amounts. Using a prism he broke up visible light he put a thermometer in the different colours. He found that the temperature got more massive as he moved the thermometer from violet to red after this He then measured the temperature where there was no visible light ( red end of the spectrum) and it was the hottest. This is how he discovered infrared light. Herschel's early observational work soon focused on the search for pairs of stars that were very close together visually. Astronomers of the era expected that changes over time in the apparent separation and relative location of these stars would provide evidence for both the proper motion of stars and, by means of parallax shifts in their separation, for the distance of stars from the Earth. He soon discovered many more binary and multiple stars than expected, and compiled them with careful measurements of their relative positions.

Ritter discovered ultraviolet, he believed and hypothesized that there must also be invisible radiation beyond the violet end of the spectrum He measured the speed at which different colours of light were broken down, As a result, Ritter confirmed the common belief that violet light was more effective than red, this is now knows as ultraviolet.Some of Ritter's researches were acknowledged as important scientific contributions, but he also claimed the discovery of many phenomena that were not confirmed by other researchers. he reported that the Earth had electric poles and he claimed that he could produce the electrolysis of water using a series of magnets.