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A lightning rod at the highest point of a tall building, connected to a ground rod by a wire. Español: Diagrama de un sistema de pararrayos simple. Un pararrayos en el punto más alto de un edificio alto, conectado a una varilla de tierra por un cable.
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White-ground technique is a style of white ancient Greek pottery and the painting in which figures appear on a white background. It developed in the region of Attica , dated to about 500 BC. It was especially associated with vases made for ritual and funerary use, if only because the painted surface was more fragile than in the other main ...
Image:Map of USA-bw.png – Black and white outlines for states, for the purposes of easy coloring of states. Image:BlankMap-USA-states.PNG – US states, grey and white style similar to Vardion's world maps. Image:Map of USA with county outlines.png – Grey and white map of USA with county outlines.
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The following other wikis use this file: Usage on es.wikipedia.org Pez eléctrico; Usage on id.wikipedia.org Belut listrik; Gymnotiformes; Ikan listrik
An illusory contour is a perceived contour without the presence of a physical gradient. In examples where a white shape appears to occlude black objects on a white background, the white shape appears to be brighter than the background, and the edges of this shape produce the illusory contours. [9]
A gentleman's 1778 version of the lightning hat involved an umbrella with a tip extended into a pointed rod. [11] A metal chain ran from the rod over the exterior of the open umbrella and down onto the ground, thus providing a conduit for the lightning to follow. [10] In French, the lightning umbrella was called le parapluie-paratonnerre. [10]