A large set of 'Clock Books' recording Clock Errors. Includes:

17 volumes recording 'Apparent errors of the Sidereal Standard Clock, and adopted clock rates and clock errors at 0h Sidereal', for 1806-1813, 1899-1911, 1919-1921, 1929-1940 (on printed Forms No. 8 and 8*);

3 volumes of 'Apparent errors of the Sidereal Standard Clock, and adopted clock rates and clock errors at 0h Sidereal' retitled 'E & E Personal Equation Determination', 1895-1909 (on printed Forms No. 8*);

2 volumes recording 'clock comparisons with standard' for 1924-1927 (on printed Forms No. 15).