| Reference number | NLB/70/557 |
| Alternative reference number | NLB/70 p291 |
| Level | Item |
| Title | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to F. M. Allchin Esq.; 52 Welbeck Street, W.1. |
| Date | 18 May 1927 |
| Description | Gives F. M. Allchin permission to reproduce the chart on the range of electromagnetic waves, originally published in 'Phases of Modern Science' in connection with the Royal Society's exhibit at the British Empire Exhibition in 1925. |
| Extent | 1p |
| Format | Carbon |
| Access status | Open |