Thomas Mercer chronometer made in modern times doubles estimate in Gloucestershire
By the 1980s, Thomas Mercer of St Albans had made almost a third of all chronometers in history – including that used by Ernest Shackleton to navigate his men to Elephant Island and eventual rescue during the Trans-Arctic Expedition of 1914.
Less often encountered are Mercer table clocks that were made to equally high standards well into …