History of the Time Ball
ball is a large white ball weighing 762 kg. It has been signalling
one o' clock in Edinburgh since 1852.
original purpose was to give an accurate time to sailors in the Firth of
Forth, about three miles to the north of Calton Hill.
Professor Charles Piazzi Smyth, was a prominent early
photographer. He was born in Naples in 1800 and went on to
become the 2nd Astronomer Royal for Scotland, a post that he held from 1846 to 1888.
set up the time ball with the help of clockmaker Frederick James Ritchie.
was originally linked to a master clock in the City Observatory, whose
time was set from observation of the stars.
the time ball was linked to the One o' Clock Gun by a wire that
stretched across the Waverley Valley. The One o' Clock Gun
was installed on the ramparts at Edinburgh Castle in 1861.