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er which is exactly divisible by no number except itself or unity, as 5, 7, 11. -- Prime vertical (Astron.), the vertical circle which passes through the east and west points of the horizon. -- Prime-vertical dial, a dial in which the shadow is projected on the plane of the prime vertical. -- Prime-vertical transit…

A form the planes of which are parallel to the vertical axis. See Form, n., 13. Achromatic prism (Opt.), a prism composed usually of two prisms of different transparent substances which have unequal dispersive powers, as two different kinds of glass, especially flint glass and crown glass, the difference of dispersive…

lain or telescopic sights, and usually having a plumb line or spirit level for fixing the vertical or horizontal direction. Gunner's quadrant, an instrument consisting of a graduated limb, with a plumb line or spirit level, and an arm by which it is applied to a cannon or mortar in adjusting it to the elevation require…

Arranged in five vertical rows; pentastichous. Gray.

sive artificial group of invertebrates, having all the parts arranged radially around the vertical axis of the body, and the various organs repeated symmetrically in each ray or spheromere.

orming part of the track on which the wheels roll. It is usually shaped with reference to vertical strength, and is held in place by chairs, splices, etc.

A fissure or mineral vein traversing the strata vertically, or nearly so; -- called also rake-vein. Gill rakes. (Anat.) See under 1st Gill.

The angle which the plane of the dial makes with a vertical plane which it intersects in a horizontal line. Brande & C.

Recumbent. Reclining dial, a dial whose plane is inclined to the vertical line through its center. Davies & Peck (Math. Dict.).

Arranged in exactly vertical ranks, as the leaves on stems of many kinds; -- opposed to curviserial.

A step or vertical offset in a wall on uneven ground, to keep the parts level.

le existence of unknown elements. TABLE OF THE PERIODIC LAW OF THE CHEMICAL ELEMENTS (The vertical columns contain the periodic groups) Series1{ 2{ 3{ 4{ 5{ 6{ 7{ 8{ 9{ 10{ 11{ 12{ --------------------------------------------------------- -----|I. II. III. IV. V. VI. VII. VIII. | RH4 RH3 RH3 RH |R2O RO R3O3 RO2 R2O5 RO…

The tincture black; -- represented by vertical and horizontal lines each other.

hough tightly drawn; the floor of a room sags; hence, to lean, give way, or settle from a vertical position; as, a building may sag one way or another; a door sags on its hinges.

- also called gate. French sash, a casement swinging on hinges; -- in distinction from a vertical sash sliding up and down.

An old term for a vertical section of a building; -- called also sciagraphy. See Vertical section, under Section.

arge net, one edge of which is provided with sinkers, and the other with floats. It hangs vertically in the water, and when its ends are brought together or drawn ashore incloses the fish. Seine boat, a boat specially constructed to carry and pay out a seine.

Of or pertaining to an earthquake; caused by an earthquake. Seismic vertical, the point upon the earth's surface vertically over the center of effort or focal point whence the earthquake's impulse proceeds, or the vertical line connecting these two points.

The process of making a vertical side cutting in working into a face of coal. Shearing machine. (a) A machine with blades, or rotary disks, for dividing plates or bars of metal. (b) A machine for shearing cloth.

Stright up and down; vertical; prpendicular. A sheer precipice of a thousand feet. J. D. Hooker. It was at least Nine roods of sheer ascent. Wordsworth.