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Optically, a crystal ball is a ball lens. For typical materials such as quartz and glass, it forms an image of distant objects slightly beyond the surface of the sphere, on the opposite side. Unlike conventional lenses, the image-forming properties are omnidirectional (independent of the direction being imaged) This omnidirectional focusing can ...
A plasma ball with filaments extending between the inner and outer spheres. A plasma ball, plasma globe, or plasma lamp is a clear glass container filled with noble gases, usually a mixture of neon, krypton, and xenon, that has a high-voltage electrode in the center of the container. When voltage is applied, a plasma is formed within the container.
Marble (toy) A marble is a small spherical object often made from glass, clay, steel, plastic, or agate. They vary in size, and most commonly are about 13 mm (1⁄2 in) in diameter. These toys can be used for a variety of games called marbles, as well being placed in marble runs or races, or created as a form of art.
See the Three-ball main article for the game. Also the 3. The object ball numbered 3 ; in American-style pool ball sets, it is solid red. In some American snooker ball sets, the green ball is numbered 3, its point value. 3-cushion See the Three-cushion billiards main article for the game. 4 ball See the Four-ball billiards main article for the game. Also the 4. The object ball numbered 4 ; in ...
Witch balls sometimes measure as large as seven inches (18 cm) in diameter. The witch ball is traditionally, but not always, green or blue in colour and made from glass (others, however, are made of wood, grass, or twigs instead of glass). Some are decorated in swirls and brilliant stripes of various colours. Witch balls normally have a hole in ...
A Confederate cannoneer remembered, "Our guns were 12 pound brass Napoleons, smooth bore, but accounted the best gun for all round field service then made. They fired solid shot, shell, grape and canister, and were accurate at a mile. We would not have exchanged them for Parrott Rifles, or any other style of guns. They were beautiful, perfectly ...
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