An undated photostat of a letter from Nevil Maskelyne to S.B. Vince, 5 January 1811, informing him that he will be pleased to welcome him and Mrs Vince to the Observatory, and giving details of Mayer's Table illustrated by a geometrical scheme. There is also a note by Margaret Maskelyne stating that this letter was written a few weeks before her father's death. There are two versions of each item - the original and a copy.