| 释义 |
Ringelmann chart Ringelmann chart[′riŋ·gəl‚män ‚chärt] (engineering) A chart used in making subjective estimates of the amount of solid matter emitted by smoke stacks; the observer compares the grayness of the smoke with a series of shade diagrams formed by horizontal and vertical black lines on a white background. Ringelmann chartA chart used as the basis for evaluating the density of smoke discharged from chimneys. |