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Prosper-René Blondlot (French: [pʁɔspɛʁ ʁəne blɔ̃dlo]; 3 July 1849 – 24 November 1930) was a French physicist, who in 1891 made the first measurement of the speed of radio waves, but is now mostly remembered for his "discovery" of N rays, a phenomenon that subsequently proved to be illusory.
Installing elaborate wooden fretworks on residential buildings, known as gingerbread trims, became popular in North America in the late 19th century. [2] Fretwork patterns originally were ornamental designs used to decorate objects with a grid or a lattice. Designs have developed from the rectangular wave Greek fret to intricate intertwined ...
A building's surface detailing, inside and outside, often includes decorative moulding, and these often contain ogee-shaped profiles—consisting (from low to high) of a concave arc flowing into a convex arc, with vertical ends; if the lower curve is convex and higher one concave, this is known as a Roman ogee, although frequently the terms are used interchangeably and for a variety of other ...
An oblique projection of a focus-balanced parabolic reflector. It is sometimes useful if the centre of mass of a reflector dish coincides with its focus.This allows it to be easily turned so it can be aimed at a moving source of light, such as the Sun in the sky, while its focus, where the target is located, is stationary.
If a concave parabolic obstacle is used, a plane wave pulse will converge on a point after reflection. This point is the focal point of the mirror. Circular waves can be produced by dropping a single drop of water into the ripple tank. If this is done at the focal point of the "mirror" plane waves will be reflected back.
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