Paper, 'A short account of some observations made with chronometers in two expeditions sent out by the Admiralty at the recommendation of the Board of Longitude for ascertaining the longitude of Madeira and of Falmouth' in a letter from Dr J L [John Lewis] Tiarks to Thomas Young Includes manuscript annotations by John Frederick William Herschel. Refers to Madeira, Portugal and Falmouth, Cornwall. Subject: Geodesy Published in Philosophical Transactions as 'A short account of some observations made with chrono­meters, in two expeditions sent out by the admiralty, at the recommendation of the board of Longitude, for ascertaining the Longitude of Madeira and of Falmouth. In a letter to Thomas Young, M. D. For. Sec. R. S. and Secretary to the Board of Longitude. By Dr. John Lewis Tiarks'. Read 29 April 1824. Abstract of the paper published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 2, 1833. [1824]