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In a comprehensive manner; with great extent of scope.

The quality of being comprehensive; extensiveness of scope. Compare the beauty and comprehensiveness of legends on ancient coins. Addison.

for confining or flattening between glass plates an object to be examined with the microscope; -- called also compressorium.

Relative position or aspect of the planets; the face of the horoscope, according to the relative positions of the planets at any time. They [astrologers] undertook . . . to determine the course of a man's character and life from the configuration of the stars at the moment of his birth. Whewell.

nfavorable wind. -- Cross wires, fine wires made to traverse the field of view in a telescope, and moved by a screw with a graduated head, used for delicate astronomical observations; spider lines. Fixed cross wires are also used in microscopes, etc.

te of aggregation is so fine that no distinct particles are visible, even under the microscope.

m carbonate, brought from Iceland, and used in certain optical instruments, as the polariscope. -- Rock crystal, or Mountain crystal, any transparent crystal of quartz, particularly of limpid or colorless quartz.

A genus of minute Entomostraca, found both in fresh and salt water. See Copepoda.

The act of defining; determination of the limits; as, the telescope accurate in definition.

A sort of electroscope, invented by Rousseau, in which the dry pile is employed to measure the amount of electricity transmitted by different bodies, or to determine their conducting power. Nichol.

Having the quality of unloosing or separating. Clarke. Dialytic telescope, an achromatic telescope in which the colored dispersion produced by a single object lens of crown glass is corrected by a smaller concave lens, or combination of lenses, of high dispersive power, placed at a distance in the narrower part of the…

in instruments to cut off marginal portions of a beam of light, as at the focus of a telescope.

Pertaining to the dichroscope, or to observations with it.

Extent; reach; scope; importance; as, a project of large dimensions.

of the refraction of light; refractive; as, the dioptric system; a dioptric glass or telescope. "Dioptrical principles." Nichol. Dioptric curve (Geom.), a Cartesian oval. See under Cartesian.

out, or perceived; as, many minute animals are discoverable only by the help of the microscope; truths discoverable by human industry.

appearing as a point and not expanded into a disk, as the image of a faint star in a telescope.

Used for or in dissecting; as, a dissecting knife; a dissecting microscope.

(Astron.), two stars so near to each other as to be seen separate only by means of a telescope. Such stars may be only optically near to each other, or may be physically connected so that they revolve round their common center of gravity, and in the latter case are called also binary stars. -- Double time (Mil.). Same…

very small quantity of electricity, so as to render it manifest by sparks or the electroscope.