| Reference number | NLB/8/442 |
| Alternative reference number | NLB/8 p183 |
| Level | Item |
| Title | Copy letter from an unknown correspondent, to Swan Electric Engraving Company, Charing Cross Road |
| Date | 27 October 1893 |
| Description | 'Herewith a letter from Prof [Professor] Hartley & specimens of Spectra. It appears that he wants two Ph. Trans. ['Philosophical Transactions of the Royal Society'] plates, so I must trouble you for an amended estimate'. |
| Extent | 1p |
| Format | Carbon |
| Access status | Open |