Perkins Observatory were both growing. Light pollution therefore became increasingly problematic. So in 1961 the Perkins Telescope was moved to Lowell Observatory in Flagstaff, Arizona. Lowell is the largest private observatory (non-university or government affiliated) in the world. Through the end of the 20th century, the Perkins Telescope was the observatory’s largest instrument. Observing time on this instrument was shared between Lowell astronomers and the Ohio State University. The telescope at Perkins was immediately replaced with a cassegrain reflector telescope. It was donated by Michael R. Schottland, an entrepreneur from Martinsville, Virginia. At that time it was the largest privately owned telescope
Lowell National Historical Park canal raceways once used by the mills. Additionally, the park includes the Patrick J Mogan Cultural Center, which focuses on the lives of Lowell's many generations of immigrants. Other exhibits include a working streetcar line, canal boat tours exploring some of the city's gatehouses and locks, and the River Transformed / Suffolk Mill Turbine Exhibit, which shows how water power, the Francis Turbine, ran Lowell's textile factories. Lowell National Historical Park Lowell National Historical Park is a National Historical Park of the United States located in Lowell, Massachusetts. Established in 1978 a few years after Lowell Heritage State Park, it