Instrument	:	Level type NK10
Manufacturer	:	Wild Heerbrugg
Country of origin	:	Swiss
Manufacturing year	:	1965

I've obtained this level in 1995. The instrument is of Swiss origin, just as my T2 theodolite. It's a more sophiticated instrument than the NK01. This version has a tilt adjustment screw, but still no compensator like the NA2.

At the base there is a 360º scale for simple angle measurements. Reading the scale is done by a small telescope.

The instrument is roughly levelled by its levelling screws and fine tuned with a tilting screw, there is no compensator. Its accuracy is about 1.5" (0.2mm at 25 metres). The standard deviation for a 1km double run levelling is about 3mm (1σ, 68%).

For more information, see the Swiss Wild Heerbrugg virtual archives.