船の動搖計の一方式について

抄録

There are many sorts of apparatus for measuring the oscillations of ships around and in the direction of the three axes. The ordinary type of apparatus measures directly the displacement itself, but it is very difficult to get any sort of pendulum that has a period sufficiently long enough to measure the displacement of a body that is oscillating slowly, such as a ship at the period of 45 seconds to about 20 seconds. Moreover here are some cases in studying the motion of ships, when knowledge of the velocity or acceleration of oscillations is necessary.
So, utilizing the operating circuit of electronic analogue computers, we succeeded in setting up a system of measuring capable of getting displacement, velocities and accelerations at once. By integrating or differentiating once or twice the easiest of these three measurements to obtain, the remaining two measurements will automatically be obtained.
We made a set of integrators, differentiatars and multipliers by the circuit of ana-com., and by using an angular velocity meter of a rate gyroscope unit as a pick up, we established a measuring system of angular oscillations of ships.
We used this set on the voyage of a certain ship, and because we received excellent results, we want to report our method and conclusions in the following paper.