What is Herschelian telescope?
[[File:Diagram Reflector Herschel.svg|thumb]] A '''Herschelian telescope''' was invented in the 1780s by [[William Herschel]]. It is similar to a [[Newtonian telescope]], except using only one [[mirror]]. In the 1780s, [[telescopes]] used metal mirrors which were not very [[Reflection|reflective]]. Each mirror would [[wikt:absorb|absorb]] light and make the image dimmer. So Herschel invented a telescope with a tilted mirror that put the eyepiece in the front. When mirrors became more reflective, Herschelian telescopes stopped being useful. {{science-stub}} [[Category:Telescopes]]