Studies on the shape-description apparatus of the ridge by automatic contorl system

The first report on the design and a trial manufacture of an automatic controller

Abstract

We have been so far, in many cases, applying a simple sketch for the description of the shapes of furrow—or ridge section, but now we have come to construct an automatic controller to record the shapes automatically with accuracy and swiftness. The way it works is as follows; the point of a needle, connected with the grid circuit of a sharp cut-off vaccum tube, tracks the soil surface in continuance vibration, while it is controlled automatically by the joint motion of relay and muter.
The present roport, based on this principle, derives from the theory of control the conditions to keep the system in steady and swift motion and shows the data of actual measurement by a trial manufacture.