the building of the Dhu Heartach lighthouse by Thomas Stevenson
(Robert Louis' father) the Isle of Earraid was used as a shore station
for the workmen. Robert Louis Stevenson spent time there in 1870
and David Balfour in 'Kidnapped' swam ashore to Earraid after the
shipwreck on the Torran Rocks.
story 'The Merry Men', first published in 1882 was set there.
Islands of Robert Louis Stevenson