| Reference number | RBO/18/11 |
| Alternative reference number | RBO.18.55 |
| Level | Item |
| Title | Testimonial 'of a trial of George Reynoldson's hydrographical machine for measuring a Ships way at Sea between London and Gravesend' |
| Date | 1732 |
| Description | Trial started at the Bell Dock Wapping on board the Prince William yacht - sailed to Gravesend and machine said the distance was 19.4 miles
Testimonial signed by William Banke, A Hammond and Richard Christopher
Read to the Royal Society on 21 December 1732 |
| Language | English |
| Extent | 2 sides |
| Format | Manuscript |
| Digital images | View item on Science in the Making |
| Access status | Open |