| Reference number | NLB/72/497 |
| Alternative reference number | NLB/72 p266 |
| Level | Item |
| Title | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to J. Drummond Robertson, Esq.; Comrie Lodge, Torquay |
| Date | 14 November 1929 |
| Description | Answers J. Drummond Robertson's enquiry into Hooke's pendulum and the early history of the application of the pendulum in horology. Informs him in some detail of the steps Hooke made in 1666 and 1667 to experiment on and improve circular pendulums. |
| Extent | 1p |
| Format | Carbon |
| Access status | Open |