A volume entitled 'Chronometers Time Ball Reports 1879-1890', divided into four sections:

'Chronometers - Admiralty': correspondence and other papers regarding the testing of chronometers at the Cape Observatory and the provision for ships, 1879-1890.

'Time Signal. Simon's Town. Reports': written reports on the working of the Simon's Town Time Ball, showing when it failed or operated incorrectly and for what reason, 1882-1890.

'Time Signal. Port Elizabeth. Reports of Telegraph Department': written reports on the working of the Port Elizabeth Clock and Time Ball, 1879-1890.

'Time Signal. Port Elizabeth. Reports of Lighthouse Keeper': written reports on the working of the Port Elizabeth Time Ball as prepared by the lighthouse keeper, with his remarks concerning its operation, 1879-1890.