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The Schmidt–Cassegrain design is very popular with consumer telescope manufacturers because it combines easy-to-manufacture spherical optical surfaces to create an instrument with the long focal length of a refracting telescope with the lower cost per aperture of a reflecting telescope. The compact design makes it very portable for its given ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 30 January 2025. Classified advertisements website Craigslist Inc. Logo used since 1995 Screenshot of the main page on January 26, 2008 Type of business Private Type of site Classifieds, forums Available in English, French, German, Dutch, Spanish, Italian, Portuguese Founded 1995 ; 30 years ago (1995 ...
Nowadays Herbert Schmidt guns are rare, spare parts almost do not exist, and their low price makes them uninteresting for collectors. In Europe, collectors pay increasingly high sums for Herbert Schmidt single-action models, especially the blank-firing versions. Prices can vary from US$75.00(great/showroom condition) to $5.00 (mean value approx ...
A Schmidt corrector plate is an aspheric lens which corrects the spherical aberration introduced by the spherical primary mirror of the Schmidt or Schmidt–Cassegrain telescope designs. It was invented by Bernhard Schmidt in 1931, [ 6 ] although it may have been independently invented by Finnish astronomer Yrjö Väisälä in 1924 (sometimes ...
In 1992 Schmidt & Bender Hungaria Optik GmbH in Budapest, Hungary was founded as an independent company by Schmidt & Bender GmbH & Co. KG, Biebertal, Germany. The process of privatisation in Hungary made it possible for Schmidt & Bender to buy the production of precision optics and fibre optics from the government-owned enterprise of the Hungarian Opticai Works (MOM).
A neodymium magnet (also known as NdFeB, NIB or Neo magnet) is a permanent magnet made from an alloy of neodymium, iron, and boron to form the Nd 2 Fe 14 B tetragonal crystalline structure. [1] They are the most widely used type of rare-earth magnet .
The stub nib comes to a flat point, like a broad nib, and pulling the pen down will create a wider line than a line drawn across, again, like a broad nib. The main differences are in matters of degree. In a stub nib, the nib is generally smaller than in a broad nib, though there are some very broad nibs that would be considered a stub nib.
The historical Burro Schmidt Tunnel is located in the El Paso Mountains of the northern Mojave Desert, in eastern Kern County, southern California. It is a 0.5-mile (0.80 km) mining tunnel dug with hand tools and dynamite over a 38-year period by William "Burro" H. Schmidt (1871–1954).