| RefNo | HD/6/8/7/12/21 |
| Previous numbers | 93HD.9.6.21 |
| Level | Item |
| Title | Copy Dale to Lord Rayleigh |
| Date | 2 May 1942 |
| Description | Thanking Rayleigh for the quotation from Newton's 'Opticks' concerning prisms and commenting on it |
| Extent | 1p |
| Format | Carbon copy |
| AccessStatus | Open |
| AccessConditions | OPEN - but with some restrictions |