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nded by a number of sloping facets forming a bizet; below, it has a small face or collet, parallel to the table, connected with the gridle by a pavilion of elongated facets. It is thus distinguished from the rose diamond, which is entirely covered with facets on the surface, and is flat below. This snuffbox -- on the h…

icies of the globe, in which its spherical form is disregarded, the meridians being drawn parallel to each other, and the parallels of latitude at equal distances. -- Selenographic chart, a map representing the surface of the moon. -- Topographic chart, a minute delineation of a limited place or region.…

Division into laminæ, like slate, with the lamination not necessarily parallel to the plane of deposition; -- usually produced by pressure. Basal cleavage, cleavage parallel to the base of a crystal, or to the plane of the lateral axes. -- Cell cleavage (Biol.), multiplication of cells by fission. See Segmentation. -…

One of thirty regions or zones, parallel to the equator, into which the surface of the earth from the equator to the pole was divided, according to the successive increase of the length of the midsummer day.

The plane in crystals of the monoclinic system which is parallel to the vertical and the inclined lateral (clinidiagonal) axes.

To render parallel to a certain line or direction; to bring into the same line, as the axes of telescopes, etc.; to render parallel, as rays of light.

opening or slit which is at the principal focus of the lens, used for producing a beam of parallel rays; also, a lens so used.

c or angle (Geom.), the difference between that arc or angle and 90º. -- Complement of a parallelogram. (Math.) See Gnomon. -- In her complement (Her.), said of the moon when represented as full.

several distinct photographs. F. Galton. -- Composite sailing (Naut.), a combination of parallel and great circle sailing. -- Composite ship, one with a wooden casing and iron frame.

Consisting of a series of parallel cones, each made up of many concentric cones closely packed together; -- said of a kind of structure sometimes observed in sedimentary rocks.

(Geol.) The parallelism of two sets of strata which are in contact.

(Geol.) Parallel, or nearly so; -- said of strata in contact.

ctions), two diameters of an ellipse or hyperbola such that each bisects all chords drawn parallel to the other. -- Conjugate focus (Opt.) See under Focus. -- Conjugate mirrors (Optics), two mirrors so placed that rays from the focus of one are received at the focus of the other, especially two concave mirrors so pla…

in such a manner as always to meet a given straight line and a given curve, and continue parallel to a given plane. Math. Dict.

Having similarity of sequence; -- said of certain parallel progressions of two parts in a piece of harmony; as, consecutive fifths, or consecutive octaves, which are forbidden. Consecutive chords (Mus.), chords of the same kind suceeding one another without interruption.

k shaft drives the rear wheels through a clutch, change-speed gear, countershaft, and two parallel side chains, in order.

Having cogs or teeth projecting parallel to the axis, instead of radiating from it. [R.] Contrate wheel. See Crown wheel.

ialogue. The influence exercised by his [Johnson's] conversation was altogether without a parallel. Macaulay.

an instrument; as, chronometer correction; compass correction. Correction line (Surv.), a parallel used as a new base line in laying out township in the government lands of the United States. The adoption at certain intervals of a correction line is necessitated by the convergence of of meridians, and the statute requi…

Reciprocal relation; corresponding similarity or parallelism of relation or law; capacity of being converted into, or of giving place to, one another, under certain conditions; as, the correlation of forces, or of zymotic diseases. Correlation of energy, the relation to one another of different forms of energy; -- usua…