The Campbell-Stokes Heliograph sunshine recorder from Tiree Met Station.
Courtesy of Mr Ray Sharp
The Campbell-Stokes sunshine recorder was invented in 1853 by John Francis Campbell, the editor of ‘Popular Tales of the West Highlands’, and modified by Sir George Gabriel Stokes in 1879. It consists of a glass sphere, about ten centimetres in diameter, mounted on a metal stand.
Manufactured to Met Office specification, the glass sphere focuses the rays of the sun to an intense spot which chars a mark on a curved graduated card mounted concentrically with the sphere. As the earth rotates, the position of the spot moves across the card. The card is held in place by grooves, of which there are three overlapping sets, to allow for the height of the sun during different seasons of the year.
Its main advantage is its simplicity and ease of use. However, the results require interpretation by an observer and may differ from one person to another.
Black and orange striped drugget (232 x 84 mm) with blue cotton tasselled fringe, made from Tiree wool and woven in Tiree, found in Salum House in the late 19th or early 20th century.
Wooden box (220 x 157 x 58 mm) with small brass plaque on lid with `A M 1939` containing a set of draughtsman`s compasses, made by Aston & Mander of London. Thought to be an instrument set used by the Met Office during WWII.
Tiree Association badge, gold-coloured metal and gold-coloured metal with Tiree crest and motto `Tir an eorna, Tir mo chridhe`/ Land of corn, Land of my heart.
Adze used for boat-building and/or carpentry. Used by Eoghan Ruadh and his family in Vaul for boat-building and by his son Lachlan during the construction of the Tiree pier ca. 1912. Found in Donald Brown`s boatshed in Vaul.