cyanometer

[Gr.kyanos=dark blue, and Sau ure, for determining the of characteristic odor.' metron a measure.) An apparatus invented by the atmosphere. A circular band of thick paper is divided into fifty-one parts, each of which is painted with a different shade of blue; the extremities of the scale being respectively deep blue and nearly white. The colored band is held in the hand of the observer, who distinguishes the particular tint corresponding to the color of the sky. The number of this tint, reckoning from the light end, indicates the intensity of the blue. ( Knight .)