The Clark Telescope is a historic refracting telescope located at the Williams College in Massachusetts. Built in 1887, it features a 12-inch diameter lens, making it one of the largest refractors in the United States. The telescope was designed by Alvan Clark, a renowned optician known for his expertise in crafting high-quality lenses. This telescope has played a significant role in astronomical research and education. It has been used to observe various celestial objects, including planets and star clusters. Today, the Clark Telescope continues to be an important tool for both students and amateur astronomers, fostering interest in the field of astronomy.