Copper & Steel Plate Printing Office,
78, Margaret St. Cavendish Sqre W.
Jan 31. 1870
H. Fox Talbot Esq
It was about July & Augt 1866 that the three plates were steeled – The process does make them last for an indefinite number as when one coating begins to shew the copper through it, it is most easily taken off and a second put on & so on as often as necessary.
I am Dear Sir Yours truly
pp T Brooker