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The dark space within the negative-pole glow at the cathode of a vacuum tube, observed only when the pressure is low enough to give a striated discharge; -- called also Crookes layer.

A sulphide of chromium observed in some meteoric irons.

group which exhibits degraded forms; degeneration. The degradation of the species man is observed in some of its varieties. Dana.

t right, or like the hands of a watch when the apex of the spire is toward the eye of the observer.

the seen or visible horizon below the true or natural horizon; the angle at the eye of an observer between a horizontal line and a tangent drawn from the eye to the surface of the ocean. -- Dip of the needle, or Magnetic dip, the angle formed, in a vertical plane, by a freely suspended magnetic needle, or the line of…

istinguishes, perceives, or judges; as, a discerner of truth, of right and wrong. A great observer and discerner of men's natures. Clarendon.

Not to regard; to pay no heed to; to omit to take notice of; to neglect to observe; to slight as unworthy of regard or notice; as, to disregard the admonitions of conscience. Studious of good, man disregarded fame. Blackmore.

nith distance (Astron.), the arc on the heavens from a heavenly body to the zenith of the observer. It is the complement of the altitude. -- To keep one's distance, to stand aloof; to refrain from familiarity. If a man makes keep my distance, the comfort is he keeps his at the same time. Swift.

One who discerns accurately the difference of things; a nice or judicious observer. Dryden.

ural means. There shall not be found among you any one that . . . useth divination, or an observer of times, or an enchanter. Deut. xviii. 10.

the sum, number, quantity, length, or value; to increase or grow to twice as much. 'T is observed in particular nations, that within the space of three hundred years, notwithstanding all casualties, the number of men doubles. T. Burnet.

wers droop." "Above her drooped a lamp." Tennyson. I saw him ten days before he died, and observed he began very much to droop and languish. Swift.

The day on which the festival is observed; Easter day.

g through the earth's shadow; a solar eclipse, by the moon coming between the sun and the observer. A satellite is eclipsed by entering the shadow of its primary. The obscuration of a planet or star by the moon or a planet, though of the nature of an eclipse, is called an occultation. The eclipse of a small portion of…

e. In the Greek poets, as also in Plautus, we shall see the economy . . . of poems better observed than in Terence. B. Jonson. The Jews already had a Sabbath, which, as citizens and subjects of that economy, they were obliged to keep. Paley.

An instrument for obtaining an accurate record of the time at which any observed phenomenon occurs, or of its duration. It has an electro-magnetic register connected with a clock. See Chronograph.

ity; to order; to charge. High matter thou enjoin'st me. Milton. I am enjoined by oath to observe three things. Shak.

al equation. See under Normal. -- Personal equation (Astron.), the difference between an observed result and the true qualities or peculiarities in the observer; particularly the difference, in an average of a large number of observation, between the instant when an observer notes a phenomenon, as the transit of a sta…

ed; equipoise. In . . . running, leaping, and dancing, nature's laws of equilibration are observed. J. Denham.

The difference between an observed value and the true value of a quantity.