One of two sets of two slits and 2 glass pieces with a third glass piece in the centre which can be rotated by turning a dial which has a pointer attached. The pointer over lies a yellow plastic protractor.
This poster takes the form of an open letter to the editor of the Aberdeen Observer, and questions Mr Bannerman's credentials and ability to serve as MP.
James Shaw was the Tory candidate in the 1872 by-election, brought about by the death of the MP Col Sykes. Both John Farley Leith, whom Shaw attacks here, and James Barclay, stood as Liberal candidates. John Farley Leith won.