Quote Originally Posted by pgk View Post
........but its looking as though Thomas Grubb was the first maker to produce the Doublets which would become better known as Rapid Rectilinear lenses, in 1864 ..... tbc
This has already been noted on the literature - mostly in the 19th Century - in Trail Taylor’s collected articles. Grubb is reported as being annoyed, but didn’t get involved in the Steinheil/Dallmeyer debate, as far as I know.