Newtonian telescope
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The Newtonian telescope, also called the Newtonian reflector or just a Newtonian, is a type of reflecting telescope invented by the English scientist Sir Isaac Newton, using a concave primary mirror a
A large Newtonian telescope with a ladder to reach the eyepiece in Springfield, Vermont
A replica of a second reflecting telescope Newton presented to the Royal Society in 1672 (the first one he made in 1668 was loaned to an instrument maker but there is no further record of what happened to it).
Dobsonian telescope
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A Dobsonian telescope is an altazimuth-mounted Newtonian telescope design popularized by John Dobson in 1965 and credited with vastly increasing the size of telescopes available to amateur astronomers
Newtonian telescope
…parabolic mirror. His Newtonian with a mirror diameter of 6 inches (150 mm) compared favourably with the large aerial refracting telescopes of the day. Dobsonian telescope - type of portable Newtonian telescope List of telescope types…
A Dobsonian telescope on display at Stellafane in the early 1980s
Two amateur built Dobsonians at Stellafane in the early 1980s
A modified Dobsonian from 1983 that features a collapsible open tube assembly with integrated bearing surface and a very compact "rocker box" mount.
Two Dobsonians that combine a truss tube, compact "rocker box", large radius altitude bearings, and a collapsible design.