| 摘要 |
A device for indicating both a horizontal direction and an angle sector about said direction, formed of a disc rotatably supported in a housing with its center of gravity offset relative to the axis of rotation of the disc, the disc being transparent except for a substantially sector-shaped non-transparent area. Two or more reading members are provided for reading the position of said sector relative to the housing. The reading members are positioned so that said members are covered by said sector-shaped area when the housing shows a horizontal direction, and the sector-shaped area is displaced from a condition covering two or more members to a condition exposing one or more members when the disc is rotated through an angle greater than a certain angle relative to the housing. |
