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The end of train device ( ETD ), sometimes referred to as an EOT, flashing rear-end device ( FRED) or sense and braking unit ( SBU) is an electronic device mounted on the end of freight trains in replacement of a caboose. They are divided into three categories: "dumb" units, which only provide a visible indication of the rear of the train with ...
A Schmidt–Pechan prism is a type of optical prism used to rotate an image by 180°. These prisms are commonly used in binoculars as an image erecting system. The Schmidt–Pechan prism makes use of a roof prism section (from the German: "Dachkante", lit. roof edge ). Binoculars designs using Schmidt–Pechan prisms can be constructed more ...
Levelling or leveling ( American English; see spelling differences) is a branch of surveying, the object of which is to establish or verify or measure the height of specified points relative to a datum. It is widely used in geodesy and cartography to measure vertical position with respect to a vertical datum, and in construction to measure ...
The Antikythera mechanism ( / ˌæntɪˈkɪθɪərə / AN-tih-KIH-ther-ə) is an Ancient Greek hand-powered orrery (model of the Solar System), described as the oldest known example of an analogue computer [1] [2] [3] used to predict astronomical positions and eclipses decades in advance. [4] [5] [6] It could also be used to track the four-year ...
Metanoia (rhetoric) Metanoia (from the Greek μετάνοια, metanoia, changing one's mind) in the context of rhetoric is a device used to retract a statement just made, and then state it in a better way. [1] As such, metanoia is similar to correction. Metanoia is used in recalling a statement in two ways, either to weaken the prior ...
Incomitant strabismus cannot be fully corrected by prism glasses, because the eyes would require different degrees of prismatic correction dependent on the direction of the gaze. Incomitant strabismus of the eso- or exo-type are classified as "alphabet patterns": they are denoted as A- or V- or more rarely λ -, Y- or X-pattern depending on the ...
Toftness device. The Toftness Radiation Detector is an instrument used by some chiropractors. It was patented by Irwing N. Toftness in 1971, [1] and was banned from use in the United States in 1982. [2] Toftness claimed that it detected electromagnetic radiation emanating from vertebral subluxations (small dislocations). [3]
Power semiconductor device. A power semiconductor device is a semiconductor device used as a switch or rectifier in power electronics (for example in a switch-mode power supply ). Such a device is also called a power device or, when used in an integrated circuit, a power IC . A power semiconductor device is usually used in "commutation mode" (i ...