British patents issued before 1989-08-01 were subject to UK Crown Copyright for a period of 50 years. The Crown copyright on this 1906 patent has expired. Published documents from 1906 are in the public domain in the USA due to the expiration of all possible copyright. The electronic version of this document was issued by the UK Intellectual Property Office via ESP@CENET; I can find no indication that they assert any additional copyright on it. I believe, therefore, that it is in the public domain.
British patent 11,915 of 1906. Accepted 1906-11-15. Application date 1906-05-22. Philip George Nuernberger and George Rettig, Jr. "Type Casting Machine."