Telegraphic instrument for tapping out and receiving telegram messages at Scarinish Post Office between 1888 and 1930. Originally from Skye and probably operated by Margaret Robertson (Mona’s mother), who is listed as the telegraphist in the 1911 census of Tiree. There is a key for sending messages and a sounder for receiving. Known as a KOB set (key on base), it is marked “20 ohm” on the base. The lever of the mechanism is steel and unmarked.