Nasmyth telescope

Simple Nasmyth telescope
56cm Nasmyth-Cassegrain Telescope at the Walter-Hohmann-Observatory in Essen, Germany

The Nasmyth telescope, also called Nasmyth–Cassegrain or Cassegrain–Nasmyth, is a reflecting telescope developed by the Scottish inventor James Nasmyth. It is a modified form of a Cassegrain telescope, with light reflected sideways to an eyepiece.