The Flow of the Vote in Israel: A Reconsideration of Stability and Change 1

Abstract

A device for measuring the speed of a ship in a medium which includes two acoustic projector-receiver units mounted at two points on the bottom of the ship and a logic module conveniently located inside the ship and connected to the two units. The two selected points are located away from the hull of the ship to avoid any turbulence due to the motion of the ship and the line joining the two points is in the direction of the motion of the ship. From the electronic measurements of the times taken by the acoustic signals to travel from the projector of one unit to the receiver of the other unit using electrical and acoustic signals simultaneously and the distance between the two points, the speed of the ship is computed.