Gyrotheodolite
A gyro-theodolite is a surveying instrument composed of a gyroscope mounted to a theodolite. It is used to determine the orientation of true north. It is the main instrument for orientation in mine surveying and in tunnel engineering, where astronomical star sights are not visible.
History
In 1852, the French physicist Léon Foucault discovered that a gyro with two degrees of freedom points north. This principle was adapted by Max Schuler in 1921 to build the first surveying gyro. In 1949, the gyro-theodolite - at that time called a "meridian pointer" or "meridian indicator" - was first used by the Clausthal Mining Academy underground. Several years later it was improved with the addition of autocollimation telescopes. In 1960, the Fennel Kassel company produced the first of the KT1 series of gyro-theodolites. Fennel Kassel and others later produced gyro attachments that can be mounted on normal theodolites.
Operation
Gyro
Gyro may refer to:
Science and technology
Fictional characters
Other uses
Gyro (magazine)
Gyro is the official publication of its owners the Otago Polytechnic Students' Association (OPSA) at Otago Polytechnic in Otago, New Zealand. Gyro is a member of the Aotearoa Student Press Association (ASPA), and was the first polytechnic publication to fully join.
Gyro has been largely replaced with a weekly digital news-letter style publication, StudentNews. Until 2014 Gyro was printed fortnightly and covered news, features, regular columns, and reviews. Printed copies were available free of charge around the Dunedin North and Central Otago campus areas, and selected sites in Dunedin city. Archive copies may be located at Dunedin's Hocken Library.
Gyro traces its history back to the 1960s photocopied SAM (Students' Association Magazine), and was known as Kram, and Student Informer during the '70s, Informer and Pinch in the '80s, and Tech Torque during the '90s, until its re-branding as "gYRo" in the late 1990s ("Gyro" as of 2007). Gyro was published as a newsprint magazine during the late 1990s and as a glossy magazine in the late 2000s. Since 2011 it was published in a Zine format for regular issues, and a glossy for special issues (e.g. Orientation).
Gyro (food)
A gyro or gyros [ˈʝiros] (Greek: γύρος, gyros, literally 'turn') is a Greek dish made of meat cooked on a vertical rotisserie, normally beef, veal, mutton, chicken, or other alternatives such as feta or haloumi cheese, and usually served in a pita or sandwich, with tomato, onion, and tzatziki sauce.
To make gyros, pieces of meat are placed on a tall vertical rotisserie, in the shape of an inverted cone, which turns slowly in front of a source of heat, usually an electric broiler. If the meat is not fatty enough, strips of fat are added so that the roasting meat always remains moist and crisp. The rate of roasting can be adjusted by varying the strength of the heat and the distance between the heat and the meat, allowing the cook to adjust to varying rates of consumption. The outside of the meat is sliced vertically in thin, crisp shavings when done. It is generally served in an oiled, lightly grilled piece of pita, rolled up with various salads and sauces.
Name
The name comes from greek language γύρα ('turn'), the name formerly used in Greece and spelled Γύρος, The Greek pronunciation is [ˈʝiros], but the pronunciation in English is often /ˈdʒaɪroʊ/ or, occasionally /ˈɡɪəroʊ/ or /ˈjɪəroʊ/. The final 's' of the Greek form is often reinterpreted as a plural in English, leading to the formation of the singular "gyro".
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