| 摘要 |
A device adapted to be integrated with a wall hanging for indicating an off-level condition is provided. The device includes a series electrical circuit including a power supply and a signal element connected with the power supply, wherein the signal element is capable of generating a perceptible output (such as a visible light or audible sound). The device also includes a level indicating switch connected between the signal element and electrical ground. The level indicating switch is capable of connecting the signal element with electrical ground only when the device is oriented at least at a selected acute angle relative to a substantially level condition such that the signal element generates the perceptible output only when the wall hanging is oriented in an off-level condition.
|
