A very good example of a Francis Barker prismatic educational compass, dating from around the 1980's. With a jewelled pivot, screw-down transit lock, wooden case, and aluminium compass card. This model of educational compass was originally produced by Barker in the late 19th century. This compass is virtually identical to the early versions, the only major difference being that the 19th century ones had a paper compass card rather than the aluminium card found in this model. Details of the original model can be found in Paul Crespel's excellent book Trade mark London, (p.88)
In excellent condition and full working order. The transit lock works perfectly, the glass is unmarked and the wooden case is in exellent condition.