The Medford Public Library is co-sponsoring the online program “A Look Inside the Hammond Castle Museum” with John Leysath, curatorial director of the Gloucester venue. Levsath will be your guide to the unique, medieval-style home and museum of noted scientist John Hays Hammond Jr., his collection of artifacts, and his remarkable life. Hammond was one of the most prolific inventors in U.S. history, and registered more than 500 patents throughout his career. Known as “the father of radio control,” Hammond was a pioneer in many technologies, including television and sound recording. He counted among his friends and mentors Thomas Edison, Nikola Tesla and Alexander Graham Bell. He was also a collector of ancient, medieval and Renaissance artifacts, and built his castle-like home in Gloucester in the late 1920s. Register through the library’s online calendar to receive the Zoom link.