|Instrument||:||Level type Wild N2|
|Country of origin||:||Swiss|
This level was part of a very generous donation of several instruments and accessories in 2008 (among them were the Askania and Wild T2 theodolites and Cassens & Plath geodetic sextant). Made by Wild Heerbrugg around 1951 the instrument is of Swiss origin and the predecessor of the NA2 in my collection.
The instrument was once part of the inventory of the Dutch Survey Department of Rijkswaterstaat (The Ministry of Transport, Public Works and Water Management) and bought by them through Wed. J.Ahrend & Zoon a firm mainly known for office supplies.
The N2 was originally developed by Wild in 1923 and modernised in 1969. In 1960 a version with compensator was created from it and named NA2.
The instrument allowed to level a 1km double run - using the parallel plate micrometer - with an accuracy of 2.0mm (1σ, 68%), while the compensated version further improved this - using the parallel plate micrometer - to 0.3mm (1σ, 68%).
Unlike the NK01 and NK10 in my collection this N2 has no horizontal circle in its base. The 'K' in the type number of the first two indicates whether or not a level has a horizontal circle ('Kreis' in German). Equipped with a horizontal circle this instrument would then have been a NK2.
For more information, see the Swiss Wild Heerbrugg virtual archives.
: Wild levels for every levelling task