Fuentes consultadas1. WWW Grace's Guide to British Industrial History, 27/09/2018 (John Bruce and Sons) https://www.gracesguide.co.uk/John_Bruce_and_Sons
2. WWW The National Museum of American History, 27/09/2018 (John Bruce & Sons) http://americanhistory.si.edu/collections/search/object/nmah_1058376