Transparent Magnifying Lens Compass by Francis Barker in Case c.1890

A rare and very good oxidised brass transparent pebble (magnifying) lens compass by Francis Barker, London in original case c.1890. 1⅜” diameter oxidised brass pocket compass having double-sided peripheral silvered scale open to the centre and enclosed by two finely ground glass magnifying lenses. Delicately set barred needle bearing in the upper and lower lens. Scale marked with cardinals and intercardinals, cardinals to one side highlighted in red. All contained within its original dark blue faux leather covered, navy blue velvet and champagne silk lined case with push button release. Condition: The oxidised brass case in good original condition, some very minor marks, no dents or dings, the peripheral dials generally good, some age marking to the verso. Both lenses in good condition, having good magnification and clarity. One very small light scratch to one side, very small shale in the vicinity of Se on the other. Some specks visible between the lenses. The case in very good condition for its age, some losses to faux leather. Comments: An unusual antique pocket compass, very well-executed. The needle suspension being particularly smooth and well-balanced. A very similar transparent "Cyclists" compass features in the Francis Barker catalogue of c.1885. It is intensely practical since map-work is made substantially easier when able to see through the compass. A rare and very collectable pocket compass, and a wonderful and useful gift.