Comprises: a list dated 25 Jun. 1894 of clocks that from 1874 had been recognised as property of the Royal Observatory (RO), giving the use and location of all these clocks; a record covering the years 1883 to 1901, of repairs and adjustments made to clocks within the RO, including those made to clocks temporarily located there for testing; a list of RO clocks, and how they were employed, compiled in Sept. 1901; a record of the known history of the Shelton Clock, compiled in 1948.