RT @ScienceCalendar: March 24, 1693-Birthday of clock-maker John Harrison, who invented the marine chronometer.
Tweet 23/03/2013 11:11 PM
Posted by Bolton School on 23 Mar 2013
Modified by Bolton School on 16 Sep 2023
RT @ScienceCalendar: March 24, 1693-Birthday of clock-maker John Harrison, who invented the marine chronometer.