| 摘要 |
A computer including a pair of discs and cursor rotatably connected with a first logarithmic scale representing variations in wind speed on the lower disc and a second logarithmic scale representing variations in air speed on the upper disc. The upper disc includes a window through which is read indicia on the lower disc representing the wind correction angle solutions for each of the various combinations of the first and second logarithmic scales whereby the wind correction angle solution is indexed and read adjacent the appropriate wind angle on the scale of wind angles adjacent such window when an air speed is aligned with a wind speed. The upper member includes another window through which is read indicia on the lower disc representing the ground speed multiple solutions for each of the various combinations of the first and second logarithmic scales whereby the ground speed multiple solution is indexed and read adjacent the appropriate wind angle on the other scale of wind angles adjacent such other window when an air speed is aligned with a wind speed. The cursor includes a logarithmic scale representing variations of ground speed multiples corresponding to indicia solutions on the lower disc, the cursor scale having an index cooperating with a selected air speed on the second logarithmic scale whereby the ground speed is read on the second logarithmic scale adjacent the appropriate ground speed multiple on the cursor.
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