|Title||Extract of a letter from John Frederick Sackville, 3rd Duke of Dorset, to Lord Carmarthen|
|Date||15 March 1787|
|Description||On the co-operations between the British and the French over the measuring of the relative situations of the observatories of Paris and London.|
The Duke of Dorset was at the time the British Ambassador in Paris.
|Access conditions||OPEN - but photocopying forbidden.|