| 摘要 |
This invention provides an optical sight comprising a first telescope having a fixed increasing magnification whose image is combined and overlayed with the image of a second telescope having a selectable increasing magnification. The magnification of the second telescope is selected by the gunner at the beginning of the engagement in accordance with a known, conventional engagement speed of the target aircraft, thereby permitting the gunner to remember a chart of multiple target lengths for different target ranges without further consideration of target speed. |
