Abstract: A surveying system is presented comprising a surveying equipment and a radio navigation unit comprising a radio navigation antenna and a radio navigation receiver, both removably connectable both on the survey equipment and on a survey object. The object is provided with at least one target for the surveying equipment to be directed to. A removable panel co-operates with the radio navigation unit and with the survey equipment. The panel comprises a computer provided with a program system adapted for operating both the radio navigation receiver and the surveying equipment.

Abstract: An arrangement for one-man surveying, including a measuring station (1) and a target unit (2). A sighting-marker arrangement is provided which can be indicated by an indicator arrangement (7) on the measuring station. The measuring station (1) automatically takes a target seeking mode when the indicator arrangement (7) does not indicate the sighting-marker arrangement and a target following mode, when the indicator arrangement indicates the sighting-marker arrangement. The sighting-marker arrangement includes a combination of a first and a second sighting-marker unit. The first unit has a light source (8) on the target unit (2). The second unit has a light source (9) on the measuring station (1) and a reflector (11) on the target unit (2).

Abstract: The device has a lance. The lance is moved towards said molten bath level. An antenna is provided at a downward end of the lance for coaction with the slag interface (interfaces), when the lance is moved towards the slag interface (interfaces). A sensitive detection circuit is connected to said antenna. The antenna is during its downward movement capacitively coupled to said slag layer, and the detection circuit detects a predetermined impedance change (predetermined impedance changes) at the antenna provided as it is moved towards the interface (interfaces).

Abstract: A measuring device measures the width of trees and other vertically disposed objects at a distance from these objects. An aiming instrument cites various points along the object and measures a distance to the object as well as provides a signal proportional to a plumb line angle sensor, a signal proportional to a horizontal angle device, and a distance measuring signal. A computer coupled to the aiming instrument will compute the diameter of the trees or other vertically disposed objects from the distance signal, angle sensor signal and horizontal angle device.

Abstract: An apparatus for determining the position of an object which is moving along an axis at frequent intervals of time and without making mechanical contact with the object, comprising position determinator means for providing an accurate position determination of said object at relatively long intervals of time or position, means associated with said object comprised either of the combination of speedometer means and electronic integration means for time integrating the output of said speedometer means at relatively frequent time intervals for providing an instantaneous measurement signal or the combination of accelerometer means and electronic integration means for double time integrating the output of said accelerometer means at relatively frequent time intervals for providing an instantaneous measurement signal, and means for correcting the value of said instantaneous measurement signal at said relatively long intervals of time or position to be equal to said position determination made by said position deter