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Manufactured niddy-noddies can be made of different sizes, producing skeins from 12 inches in length to 4 feet in length. The most common size, however, produces a two-yard skein. [3] Very small niddy-noddies are generally used for small samples. Many spinners will spin a sample length of yarn, ply it, and skein it using a niddy-noddy before ...
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Van de Graaff generator diagram. A simple Van de Graaff generator consists of a belt of rubber (or a similar flexible dielectric material) moving over two rollers of differing material, one of which is surrounded by a hollow metal sphere. A comb-shaped metal electrode with sharp points (2 and 7 in the diagram), is positioned near each roller ...
In rail transport, a wheel arrangement or wheel configuration is a system of classifying the way in which wheels are distributed under a locomotive. [1] Several notations exist to describe the wheel assemblies of a locomotive by type, position, and connections, with the adopted notations varying by country.
Noddy (O.F. naudin [1]) also noddie, nodde or knave noddy, is a 16th-century English card game, ancestor of cribbage. It is the oldest identifiable card game with this gaming structure and thus probably also ancestral to the more-complicated 17th-century game of costly colours .
The wheel arrangement of small diesel and petrol locomotives can be classified using the same notation as steam locomotives, e.g. 0-4-0, 0-6-0, 0-8-0. Where the axles are coupled by chains or shafts (rather than side rods) or are individually driven, the terms 4w (4- wheeled ), 6w (6-wheeled) or 8w (8-wheeled) are generally used.
A homopolar generator is a DC electrical generator comprising an electrically conductive disc or cylinder rotating in a plane perpendicular to a uniform static magnetic field. A potential difference is created between the center of the disc and the rim (or ends of the cylinder) with an electrical polarity that depends on the direction of ...