| 摘要 |
An orientation indicating device, the device comprises an enclosure, a plurality of rods fixed together at their one end forming a rod structure. The rod structure is rotatably mounted inside the enclosure. At least one roller provisioned in-between an inner surface of the enclosure and a free end of each of the plurality of rods. Further, at least one rod of the plurality of rods is configured to be heavier than the other rods, and said heavier rod is adapted to point towards gravity. |
