| 摘要 |
This invention describes an illuminated spirit level that can be used in an aircraft to determine aircraft attitude as well as aircraft direction. The invention essentially comprises three levels arranged in the shape of a cross with bubble vials in each of the left and right "wings" and a bubble vial in the forward section of the central level. The levels would have a battery-operated power source to keep the device illuminated in the event that the electrical controls of the plane malfunction. Additionally, the bubble vials would contain a glow-in-the-dark fluid in case of battery failure. The spirit level could be secured to the top of the dash or alternatively, could be mounted within the instrument control panel.
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