| 摘要 |
PURPOSE:To raise an indication accuracy, by utilizing a rotational shift of a spherical body and indicating a gradient with a pointer. CONSTITUTION:A body vessel is constituted of an upper surface plate 1, a side plate 2 and a bottom plate 3. On the inside center part of the upper surface plate 1, a ring magnet 4 is made to adhere tightly, and on the center part of the bottom plate 3, a supporting pole 5 is made to adhere tightly in a state that for instance, a thumbtack has been reversed. Width of the side plate 2 is made slightly larger than the diameter of an iron ball 9. A pointer is cross- shaped, and a pointer tip part 6 is made in the form of T. The pointer center part has a conical hollowed part 8, and the conical hollowed part 8 is held by the support 5. Cylindrical magnets 13-16 on the pointer are made to adhere tightly so as to repel the ring-like magnet 4 provided on the center part of the upper surface plate 1, and it is prevented that the pointer is disengaged from the support 5. |
