Named after local astronomer Jeremiah Horrocks, this collection contains lantern slides, weather charts, records and photographs of the observatory and its staff from the early 20th Century.
A large part of this collection are documents, scrapbooks and sketches from George James Gibbs, who was the curator at the Moor Park Observatory as a replacement to the Preston Municipal Observatory at Deepdale. A keen educator and inventor of the heliochronometer, under Gibbs the observatories held a number of public lectures and events at the site, including the grand opening on 29th June 1927.