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F Barker & Son Lensatic Marching Compass

£ 185

Category
Reference
27750
Height
3 cm (1 1/4")
Diameter
5.5 cm (2 1/4")
F Barker & Son Lensatic Compass.
A great little F Barker & Son marching compass dating from around the World War I era. The compass is with its original finish with patent details on the back, 'Barkers patents 1818/15 103019/16 11002/16'. Barker developed and patented the principle of the lensatic compass in 1916 (Pat No. 103,019).

From Compass Museum.com
Lensatic compasses feature a lens attached to a foldable holder. There are different holder types: some fold inside the closed compass, other on top of the lid. The lens holder generally features a (rear) sight element, either a notch or a pin-hole through which the other (fore) sight element -originally a thin etched line on the cover window, later a metallic wire attached in a slot in the lid- can be observed together with the object being aimed at (compare with prismatic compass and mirror compass).
Height
3 cm (1 1/4")
Diameter
5.5 cm (2 1/4")
Condition
good.
Year
Circa 1918
Period
1900-1949
Medium
Brass
Country
United Kingdom