179, Strand (Corner of Norfolk Street),
111, Minories, (manufactory, 6, Vine Street.)
London, E. C.
May 30th 1865
I beg to inform you that your Spectroscope with three prisms which you kindly ordered some time since is quite ready.
It is one of the best I have ever made, as with care 2 or 3 lines may be seen in the Solar Spectrum between double D, and 1 or 2 between the D lines of a sodium flame.
Waiting your instructions,
Believe me Dear Sir Your Obedt Servt
To Fox Talbot Esq F. R. S. &c &c &c
Fox Talbot Esq. FRS. &c &c