dial

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di·al

(dī'ăl),
A clock face or instrument resembling a clock face.
[L. dies, day]

dial

a circular diagram with black lines radiating outward across a white background from the center, as is used in tests of astigmatism.

dial

(dī′ăl) [L. dialis, daily, fr. dies, day]
A graduated circular face, similar to a clock face, on which some measurement is indicated by a pointer that moves as the entity being measured (pressure, temperature, or heat) changes.

astigmatic dial

A circular dial with black lines of uniform width drawn as if they were connecting opposing numbers on the face of a clock. It is used in testing for astigmatism.
References in classic literature ?
Ordinarily, a gilded angel strikes the hour on a big bell with a hammer; as the striking ceases, a life-sized figure of Time raises its hour-glass and turns it; two golden rams advance and butt each other; a gilded cock lifts its wings; but the main features are two great angels, who stand on each side of the dial with long horns at their lips; it was said that they blew melodious blasts on these horns every hour--but they did not do it for us.
This dial with movable needle is a manometer, is it not?
Either he dodged, however, or my aim was inaccurate; for all I accomplished was the demolition of the crystal which protected the dial of the clock upon the mantel-piece.
Just as in a clock, the result of the complicated motion of innumerable wheels and pulleys is merely a slow and regular movement of the hands which show the time, so the result of all the complicated human activities of 160,000 Russians and French- all their passions, desires, remorse, humiliations, sufferings, outbursts of pride, fear, and enthusiasm- was only the loss of the battle of Austerlitz, the so-called battle of the three Emperors- that is to say, a slow movement of the hand on the dial of human history.