"Fooling around with alternating current is just a waste of time. Nobody will use it, ever."
|4739652||Method of, and tubing and support apparatus for, arranging a tubing assembly for measuring purposes|
The tubing system comprises a number of measuring stops or surfaces arranged in a predetermined mutual spaced relationship. The spacing is utilized for determining the displacements in the material enclosing the tubing. This displacement is ascertained by...
|4327590||Method and apparatus for determining shifts at terrain and in structures|
In the medium to be examined there is embedded a measuring tube which possesses at its inner surface essentially equidistantly spaced measuring markers. These measuring markers are in the form of mechanical stops or impact members having an impact surface...