Copy letter from A H White, to Dr T C Porter, Upton Park, Slough 'Dear Sir, Could you supply the engraver for his assistance the negatives of 1 or 2 of the eclipse photographs illustrating your paper for Proceedings [of the Royal Society]. The engravers are Alexander & Co of Shoe Lane. They will write direct telling you just which they want, & perhaps you wd [would] send the negatives in question direct to them. AHW'. 27 March 1907