Paper, 'An account of some observations made in London by Mr George Graham and at Black River in Jamaica by Colin Campbell concerning the going of a clock in order to determine the difference between the lengths of isochronal pendulums in those places'

George Graham, Colin Campbell, Paper, 'An account of some observations made in London by Mr George Graham and at Black River in Jamaica by Colin Campbell concerning the going of a clock in order to determine the difference between the lengths of isochronal pendulums in those places', 06 December 1733, CLP/3ii/36, The Royal Society Archives, London, https://makingscience.royalsociety.org/items/clp_3ii_36/paper-an-account-of-some-observations-made-in-london-by-mr-george-graham-and-at-black-river-in-jamaica-by-colin-campbell-concerning-the-going-of-a-clock-in-order-to-determine-the-difference-between-the-lengths-of-isochronal-pendulums-in-those-places, accessed on 16 January 2026

https://makingscience.royalsociety.org/items/clp_3ii_36/paper-an-account-of-some-observations-made-in-london-by-mr-george-graham-and-at-black-river-in-jamaica-by-colin-campbell-concerning-the-going-of-a-clock-in-order-to-determine-the-difference-between-the-lengths-of-isochronal-pendulums-in-those-places

<iframe src="https://makingscience.royalsociety.org/embed/items/clp_3ii_36/paper-an-account-of-some-observations-made-in-london-by-mr-george-graham-and-at-black-river-in-jamaica-by-colin-campbell-concerning-the-going-of-a-clock-in-order-to-determine-the-difference-between-the-lengths-of-isochronal-pendulums-in-those-places" title="Paper, 'An account of some observations made in London by Mr George Graham and at Black River in Jamaica by Colin Campbell concerning the going of a clock in order to determine the difference between the lengths of isochronal pendulums in those places'" allow="fullscreen" frameborder="0" width="100%" height="500px"></iframe>