Talk:Beauchamp Tower

Patents
Just as a link dump: (patents contain public domain images and indicates, which work was considered important at the time) -- MichaelFrey (talk) 17:33, 5 June 2015 (UTC) other information: -- MichaelFrey (talk) 06:30, 6 June 2015 (UTC)
 * https://www.google.co.in/patents/US366438
 * https://www.google.co.in/patents/US464806
 * https://www.google.co.in/patents/US640051
 * https://books.google.de/books?id=p6uPphw71JQC
 * http://rstl.royalsocietypublishing.org/content/177/157.full.pdf+html