Photocopy of article: Account of a series of observations, made in the summer of the year 1825, for the purpose of determining the difference of Meridians of the Royal Obervatories of Greenwich and Paris.
Written by J F W Herschel and published in 'Philosophical Transactions', 1826 Part 2.
A detachement of the RA under Capt Edward Sabine helped in the project by firing rockets which were observed in order to measure the difference between the observatories.
Included is a copy of a letter from Lt Largeteau of the French Army describing events at the Hatings station, 14 Jul 1825.

Account of a series of observations, made in the summer of the year 1825, for the purpose of determining the difference of Meridians of the Royal Obervatories of Greenwich and Paris