Instrument	:	Station Pointer (Protractor)
Manufacturer	:	Kelvin Hughes Co
Country of origin	:	U.K.
Manufacturing year	:	unknown

I've obtained this instrument in 1996. It is also referred to as a 'Protractor'. The instrument is used for coastal navigation using a sextant. One could measure the two angles between three coastal objects. After setting the legs of the station pointer to the right angles (adjustment is done with two verniers) it can be laid on a map showing the same objects. With the legs running over the objects on the map the center of the instrument will be your position in the map.