Antique brass level for surveying w. compass needle for Mining ?

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Seller: mikedenmark ✉️ (3,934) 97.3%, Location: Copenhagen, Denmark, DK, Ships to: WORLDWIDE, DE, GB, FR, Item: 183486435969 Antique brass level for surveying w. compass needle for Mining ?. Vintage brass level for surveying w. compass needle Mining ? Completely unmarked. No hint whatsoever at maker. From the look of it, hand built, and of good quality. Compass needle works. Accessory Water level, to adjust the telescope against the base? has a crack in the glas. No fluid left. Several parts must be missing. I can see no function for the leaf spring under the accessory top water level. My guess is something must be missing. A retangular brass plate with a small pin mounted next to the vertical angle gear cam shows wear/signs of a now missing part. Most likely some kind of leaf spring. I think it may be intended for mining or some other surveying work, where one needs to adjust for true north against local variations of the magnetic field. On all gradients readouts small pieces of paper can be mounted. My guess is, they are for fine tuning. One of the holders has been broken. See detail photo. UPDATE. It has been suggested the frames are for shading the fine adjustment with either white glass or, perhaps, paper/pergament. The division of the main base is 360 degree. Graticule is one vertical line, and 3 horisontal. Difficult to photograph, but take a look at the last photo. Any information on the use, type, or the maker, is most welcome. Shipping as an economy parcel Worldwide: $ 104.- Some european countries, are cheaper.  Germany will be $ 11.- Please inquire. Combined shipping will be possible to those same european destinations. Pick up in Copenhagen also possible.

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