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The mercury mirror of the Large Zenith Telescope in Canada was the largest liquid-metal mirror ever built. It had a diameter of 6 meters and rotated at a rate of about 8.5 revolutions per minute. It was decommissioned in 2016. [4] This mirror was a test, built for $1 million, but it was not suitable for astronomy because of the test site's weather.
Amateur telescope making is the activity of building telescopes as a hobby, as opposed to being a paid professional. Amateur telescope makers (sometimes called ATMs) build their instruments for personal enjoyment of a technical challenge, as a way to obtain an inexpensive or personally customized telescope, or as a research tool in the field of ...
A parabolic aluminized reflector lamp (PAR lamp or simply PAR) is a type of electric lamp that is widely used in commercial, residential, and transportation illumination. It produces a highly directional beam. Usage includes theatrical lighting, locomotive headlamps, aircraft landing lights, and residential and commercial recessed lights ("cans ...
A Dobsonian telescope is an altazimuth-mounted Newtonian telescope design popularized by John Dobson in 1965 and credited with vastly increasing the size of telescopes available to amateur astronomers. Dobson's telescopes featured a simplified mechanical design that was easy to manufacture from readily available components to create a large ...
A bicycle reflector appears brighter to the passenger car driver than to the truck driver at the same distance from the vehicle to the reflector. [1] The light beam and the normal axis of the reflector as shown in Figure 2 form the entrance angle. The entrance angle is a function of the orientation of the reflector to the light source.
A parabolic (or paraboloid or paraboloidal) reflector (or dish or mirror) is a reflective surface used to collect or project energy such as light, sound, or radio waves. Its shape is part of a circular paraboloid, that is, the surface generated by a parabola revolving around its axis. The parabolic reflector transforms an incoming plane wave ...
A freshwater aquarium with plants and various tropical fish. An aquarium (pl.: aquariums or aquaria) is a vivarium of any size having at least one transparent side in which aquatic plants or animals are kept and displayed. Fishkeepers use aquaria to keep fish, invertebrates, amphibians, aquatic reptiles, such as turtles, and aquatic plants.
April Wilkerson. Born. 1987 (age 36–37) Corpus Christi, Texas, U.S. Nationality. American. Known for. DIY construction videos. April Wilkerson (born 1987) is an American YouTuber who specializes in do-it-yourself woodworking and metalworking projects around the home. [1][2][3][4][5]
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