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An arrangement of two lenses for a microscope, designed to correct spherical aberration and chromatic dispersion, thus rendering the image of an object more clear and distinct. W. H. Wollaston.

The bottom part of a flask or mold, the upper part being the cope.

f a liquid, affording a feeble current, and chiefly useful in the construction of electroscopes of great delicacy; -- called also Zamboni's , from the names of the two earliest constructors of it. -- Dry pipe (Steam Engine), a pipe which conducts dry steam from a boiler. -- Dry plate (Photog.), a glass plate having a…

A level having a short telescope (hence its name) rigidly fixed to a table capable only of rotatory movement in a horizontal plane. The telescope is usually an inverting one. It is sometimes called the Troughton level, from the name of the inventor, and a variety improved by one Gavatt is known as the Gavatt level.…

An instrument for determining the magnifying power of telescopes, consisting usually of a doubleimage micrometer applied to the eye end of a telescope for measuring accurately the diameter of the image of the object glass there formed; which measurement, compared with the actual diameter of the glass, gives the magnify…

Room to extend the elbows on each side; ample room for motion or action; free scope. "My soul hath elbowroom." Shak. Then came a stretch of grass and a little more elbowroom. W. G. Norris.

d to an instrument which indicates the presence of electricity (usually called an electroscope). Balance electrometer. See under Balance.

Relating to, or made by means of, the electroscope.

The art or process of examining by means of the endoscope.

To increase the capacity of; to expand; to give free scope or greater scope to; also, to dilate, as with joy, affection, and the like; as, knowledge enlarges the mind. O ye Corinthians, our . . . heart is enlarged. 2 Cor. vi. 11.

es, many of them minute. The group embraces several orders; as the Phyllopoda, Ostracoda, Copepoda, and Pectostraca. See Copepoda, Phyllopoda, and Cladocera.

An instrument consisting of a telescope so mounted as to have two axes of motion at right angles to each other, one of them parallel to the axis of the earth, and each carrying a graduated circle, the one for measuring declination, and the other right ascension, or the hour angle, so that the telescope may be directed,…

An attachment to a microscope, telescope, or other optical instrument, for making the image erect instead of inverted.

The space commanded by the organ of sight; scope of vision; hence, face; front; the presence of an object which is directly opposed or confronted; immediate presence. We shell express our duty in his eye. Shak. Her shell your hear disproved to her eyes. Shak.

Eyepiece of a telescope, microscope, etc.

The lens, or combination of lenses, at the eye end of a telescope or other optical instrument, through which the image formed by the mirror or object glass is viewed. Collimating eyepiece. See under Collimate. -- Negative, or Huyghenian, eyepiece, an eyepiece consisting of two plano-convex lenses with their curved sur…

Syncope, or loss of consciousness owing to a sudden arrest of the blood supply to the brain, the face becoming pallid, the respiration feeble, and the heat's beat weak. Fainting fit, a fainting or swoon; syncope. [Colloq.]

A horoscope; the diagram of the aspects of the astrological houses. Johnson.

d or line; characterized by threads stretched across the field of view; as, a filar microscope; a filar micrometer.

One who, or that which, finds; specifically (Astron.), a small telescope of low power and large field of view, attached to a larger telescope, for the purpose of finding an object more readily.