The derision was poured on John Harrison, the British clockmaker whose marine chronometers had revolutionised seafaring in the 18th century (and who was the subject of Longitude by Dava Sobel).
His subsequent claim – that he would go on to make a pendulum timepiece that was accurate to within a second over a 100-day period – triggered widespread ridicule.
Pinpointing where they lay on the notional lines that run vertically on a map proved extremely difficult for navigators.
Harrison was eventually awarded a considerable sum of money for his efforts and he died a rich man.
The artist and clockmaker, Martin Burgess, – working on attempts to decipher Harrison’s plans – produced two versions of his great clock.
“Essentially we have been fine-tuning the clock so that we can bring it to its full potential and accuracy,” said McEvoy.
At the end of the trial yesterday morning, the clock read 7/8ths of a second behind GMT. »