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 Wild  NAK 1 with plan plate micrometer

Manufacturer: Wild-Leitz AG, Heerbrugg
Year: approx 1980
Price: 2500-3500 DM (1250-1750 €)
Technical data:

Standard deviation for 1 km double leveling: +- 1.5 mm (with plan plate micrometer: +-1mm)
Highest accuracy @ 30 m = 1mm
Telescope: upright picture
Magnification: 24x
Objective diameter: 36 mm
Field of view diameter @ 100 m: 3.2m
Minimum distance: 1.0
Multiplication factor: 100
Addition constant: 0
Inclination range of the compensator: +- 15'
Levelling accuracy: +- 0.5''
Sensitivity of the leveling indicator: 8' / 2
Horizontal circle to NAK1 (metal): 400 gon
Circle diameter: 91 mm
Division interval: 0,5 gon
Estimated reading: 0,1 gon

  1. Groundplate
  2. foot screws
  3. horizontal screw
  4. magnifier for reading of horizontal circle
  5. Pushbutton for function check
  6. telescope eyepiece
  7. protection cover (turnable) for target line - adjustment screw
  8. focusing screw
  9. Visor line with centering notch
  10. Telescope objective
  11. Direction Tangent

rod reading: After adjustting the telescope to the rod, the compensator must be controlled. The button shoud be pressed, and compensator checked to see that it swings freely, and reads the position of the horizontal threadis in such a way, whereby the millimeters in the Centimeter become estimated field. Since the picture is upright, numbering of the slat is from bottom to top.

Mesurment of the distance: For measurment of the distance between the instrument and the slat, the two short horizontal-lines in the telescope picture are used. The reading between the two distance lines appearing on the section, is a hundrets of the distance (accuracy about 1:500). The reading of the top line minus the buttom reading, multiplied by 100 equals the distance.

rod reading (elevation of 3,456 m, distance 29,3 m) slat reading

Plan plate micrometer: If one does not want to estimate the millimeter at the levelling rod, use to the plan plate micrometer and read the millimeter and even the 1/10 mm at the drum directly. In the plan plate micrometer small disk glass plates turns are converted into small transitions of the telescope axis. With a plan plate micrometer very accurate meassurments are possible e.g. the distance between a divisionline of a divisionand, an index line. For reading rod levelling or horizontal circles of a theodolite one use's e.g. plan; disc mikrometers.
Wild NAK1 with plan disk micrometer Wild NAK1 with plan plate micrometer
Reading mechanism (examples): Plan plate micrometer: plan disc micrometer

Angle fairs: The magnifying glass (4) for reading the horizontal circle is below the telescope eyepiece. An interval corresponds to 1 gon. Normally, one estimates on 1/10 of a degree. One can adjust and the horizontal circle manually, using at the horizontal screw for turning the horizontal circle (3) to any initial reading. For measuring one directs the vertical line in the telescope picture to the first goal or toward the centre of the levelling rod, and reads the horizontal circle (or sets it to zero). From here aim at the further points which can be measured, and read each bearing on the horizontal circle.

horizontal circle reading off NAK1 horizontal circle reading of NAK1,
400gon :106,3 gon

Compensation of the Wild NAK1
The pendulum consists (as shown in the diagramm) of four linked tensiered bands in acrossed form and carries a deviating prism, which is the mobile optical part of the compensator. The "beam" of the laws is magnified by with a factor of 10 by the drawing prism.
By pushing the controllbutton (shown on the right in the picture) the free swing of the pendelum can be checked.

Carina Oest und Hans-Bernd Lindner VT02