| 摘要 |
An aircraft head-up display is projected from symbol-markings borne by two complementary color filters superimposed in the light-path from an electric lamp. An horizon-line marking of the first filter has the color of the second filter bearing a flight-vector marking, and vice versa, but either marking may be transparent. The filters are separately driven to follow aircraft movements with the symbol-images simulating the true horizon and flight-vector. A third filter with glide-slope marking may be carried adjustably with the first filter to allow modification of indicated glide-slope below the horizon.
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