| 摘要 |
PURPOSE:To make measurement simple and exact by providing a horizontal rotating body having two objects which are different in volume and face each other on the right and left and a means for detecting the moment of the rotating body by a difference in the buoyancy acting on the objects in a liquid. CONSTITUTION:Objects 15, 17 which are freely vertically movable move vertically according to the specific gravity of a fluid 21. Since the object 15 contains an iron piece 16, the movement is detected by a coil 14 for a differential transformer. A magnet 19 is contained in the object 17. An electromagnet 18 is feedback-controlled by the output from the coil 14, by which the electromagnetic force of the electromagnet 18 is changed and the object 17 is held horizontally. The force acting between the magnet 19 and the electromagnet 18 is therefore proportional to the specific gravity of the fluid and since said force is proportional to the value of the current to be passed to the electromagnet 18, the specific gravity is measured by measuring the current value. |
