Unpublished copy of observations, 'Experiments with an invariable pendulum' by [Thomas Brisbane] Table of observations taken with an invariable pendulum in Parramatta, New South Wales [Australia] from 24 September to 15 October 1824. The original copy of these observations is found at AP/11/5/9. A manuscript inscription across the top of the first page reads 'JFWH [John Frederick William Herschel] No 57' and next to this, in another hand, 'Recd from the Pres June 1 1825'. Subject: Geodesy Communicated by the Sir H [Humphry] Davy. Received by the Royal Society 17 November 1825. September-October 1824