Spring diagram: Image courtesy of the Posner Memorial Collection, from Carnegie Mellon University Libraries. Londons Memorial Tower: Matt Bridger / DHD Multimedia Gallery. Royal Observatory: The National Maritime Museum in London.
Spring diagram: Image courtesy of the Posner Memorial Collection, Carnegie Mellon University Libraries-ல இருந்து. Londons Memorial Tower: Matt Bridger / DHD Multimedia Gallery-ல இருக்கு. Royal Observatory: National Maritime Museum, London-ல இருக்கு.