The instrument came together with the dome. The device has a scale in (NATO) mils (6400 to a degree, or around 1 milliradian per division). The compass needle can indicate other directions (it is swining freely) but there is no compass card attached to the needle to allow reading. The goniometer has a compass that is used to align it with magnetic north which allows measuring magnetic azimuths directly. As a result it is not very accurate but much easer to read (and therefore use). It does have a micrometer to allow reading fractions. The goniometer (or aiming circle) is like a boussole theodolite but with the difference that the reading is done on direct scales without any verniers or microscopes.
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