The 1.07 m (42 in) John Hall Telescope was built by AstroMechanics and installed at Anderson Mesa in 1970. It was named after former Lowell Observatory director John S. Hall in 1990. In 2004, the Ritchey-Chrétien telescope was upgraded with a new mirror from Hextek, and with other parts.
The 0.79 m (31 in) National Undergraduate Research Observatory (NURO) Telescope was built by AstroMechanics and installed in 1964 at Anderson Mesa by the U.S. Geological Survey (USGS) for Project Apollo. It was purchased by Lowell in 1972, and refurbished in 1990. It is used by the NURO consortium for up to 60% of the time, and by Lowell scientists.
The 0.33 m (13 in) Abbot L. Lowell Astrograph, also known as the Pluto Discovery Telescope and informally as the Pluto Camera, is an astrograph built by Alvan Clark & Sons in 1929. In 1930 it was used by Clyde Tombaugh to discover Pluto. In 1971, it was moved a new building at Anderson Mesa, and returned to Mars Hill in 1992.
^Hall, J. S. (1971). "Lowell Observatory, Flagstaff, Arizona. Report 1969-1970". Bulletin of the Astronomical Society3: 125. Bibcode:1971BAAS....3..125H.
^ abcHorstman, H. S.; Millis, R. L. (1991). "Lowell Observatory, Flagstaff, Arizona 86001. Report for the period 1 Jul 1989 - 30 Jun 1990". Bulletin of the Astronomical Society23: 361. Bibcode:1991BAAS...23..361H.
^Armstrong, J. T.; Mozurkewich, D.; Rickard, L. J; Hutter, D. J.; Benson, J. A.; Bowers, P. F.; Elias Ii, N. M.; Hummel, C. A. et al. (1998). "The Navy Prototype Optical Interferometer". The Astrophysical Journal496: 550. Bibcode:1998ApJ...496..550A. doi:10.1086/305365.