also called sitemeter, model 3806, made in Bern by E. F. Büchi.
This device with a compass is used to calculate the angle of fire, but also to measure deposits (azimuth) or slopes: it is in very good condition considering its great age and it works perfectly. Note the inscription "KELLER" painted on the front side, which is the name of its former owner.
MODE OF OPERATION
The push-button visible next to the leather strap (photos 4 & 6) is used to retract the metal bar locking the compass (visible across the compass rose dial). When the bar is retracted, a portion of the compass rose graduated in 3200 mils and a portion of a scale graduated from 0 to 800 (top row) and from 2400 to 32 mils (bottom row) can be seen through a prism in the viewfinder.
The subtraction disc on the back of the device (photo 5) is used to calculate the difference between two angles.
Divisions: 2 x 3200 thousandths
Protection grid: folding
Delivered with its leather case (photo 7)
Dimensions: 61 x 49 x 26 mm
Weight: 132 g (280 g with case and shipment packaging)
Swiss army artillery sitometer, around 1940
- Brand: E. F. BÜCHI Berne
- Product Code: Antiquités-instruments
- Availability: 1