| RefNo | HD/6/8/6/2/1 |
| Previous numbers | 93HD.5.7.1 |
| Level | Item |
| Title | A Carmichael, Glasgow, to Dale |
| Date | 2 December 1940 |
| Description | Informing Dale that he has made 'an important discovery in the science of navigation' enabling high speed boats and aircraft to fix their position, and desiring to demonstrate his invention to Dale in person. Dale passed the letter on to Egerton |
| Extent | 3pp |
| Format | Manuscript |
| AccessStatus | Open |
| AccessConditions | OPEN - but with some restrictions |