In rec.antiques.radio+phono Andre Jute wrote:
In this case it is easy to determine who owns the copyright of this
important old book, the RDH4, because when Newnes brought out a
facsimile edition in 1997, they trumpeted their mother ship's
ownership fo the copyright to the skies by printing in every copy:
cReed Educational and Professional Publishing Ltd 1997

So, I presume you asked them what their position is on this copyright
before posting your rants? If so, what is their position? If they still
own this copyright, that is, since your information is 10 years old.