| Reference number | NLB/6/1137 |
| Alternative reference number | NLB/6 p465 |
| Level | Item |
| Title | Copy letter from Herbert Rix, to Dr A de C Lopes, 78 Rua Evaristo da Verga, Rio de Janeiro |
| Date | 31 October 1892 |
| Description | Rix is directed by the President [William Thomson] to acknowledge receipt of the metallic disc and pamphlet illustrating the quadrature of the circle, which Lopes has sent. |
| Extent | 1p |
| Format | Carbon |
| Access status | Open |