| Reference number | NLB/55/660 |
| Alternative reference number | NLB/55 p358 |
| Level | Item |
| Title | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Sir Alexander Hargroves Brown |
| Date | 12 July 1918 |
| Description | Letter of thanks for the enclosing of a description of the Kelvin clock |
| Extent | 1p |
| Format | Carbon |
| Access status | Open |