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21 חוטר
branch, offshoot, scion, shoot, cion; rod, fescue; pointer (for reading) -
22 Zeigerfrequenzmesser
m < msr> ■ pointer frequency meter; direct-reading frequency meter -
23 Ablesefehler
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24 yad
(m.) pointer (used in reading the Torah) -
25 Zeigerfrequenzmesser
Deutsch-Englisch Wörterbuch der Elektrotechnik und Elektronik > Zeigerfrequenzmesser
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26 יד
(m.)[yad]Approximate Pronunciation (Northern / Southern) [∙]pointer (used in reading the Torah) -
27 Ctesibius (Ktesibios) of Alexandria
[br]fl. c.270 BC Alexandria[br]Alexandrian mechanician and inventor.[br]Ctesibius made a number of inventions of great importance, which he described in his book Pneumatics, now lost. The Roman engineer and architect Vitruvius quoted extracts from Ctesibius' work in his De Architectura and tells us that Ctesibius was the son of a barber and that he arranged an adjustable mirror controlled by a lead counterweight descending in a cylinder. He noticed that the weight compressed the air, which could be released with a loud noise. That led him to realize that the air was a body or substance: by means of a cylinder and plunger, he went on to invent an air pump with valves. This he connected to the keyboard and rows of pipes of an organ. He also invented a force pump for water.Ctesibius also improved the clepsydra or water clock, which measured time by the fall of water level in a vessel as the water escaped through a hole in the bottom. The rate of flow varied as the level dropped, so Ctesibius interposed a cistern with an overflow pipe, enabling the water level to be maintained; there was thus a constant flow into a cylinder and the passage of time was indicated by a float with a pointer. He fitted a rack to the float which turned a toothed wheel, to activate bells, singing birds or other "toys". This is probably the first known use of toothed gearing.Ctesibius is credited with some other inventions of a military nature, such as a catapult, but it was his pumps that established a tradition in antiquity for mechanical invention using the pressure of the air and other fluids, stretching through Philo of Byzantium (c.150 BC) and Hero of Alexandria (c.62 AD) and on through Islam into medieval Western Europe.[br]Further ReadingA.G.Drachmann, 1948, Ktesibios, Philon and Heron: A Study in Ancient Pneumatics, Copenhagen: Munksgaard (Acta Hist. Sci. Nat. Med. 4).LRDBiographical history of technology > Ctesibius (Ktesibios) of Alexandria
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28 откалиброванный прибор
Русско-английский военно-политический словарь > откалиброванный прибор
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См. также в других словарях:
Pointer (journal) — Pointer is the official journal of the Singapore Armed Forces. It is issued quarterly, and read primarily by SAF officers, warrant officers, and civilian employees of the Ministry of Defense. It is also distributed to various international… … Wikipedia
pointer — ► NOUN 1) a long, thin piece of metal on a scale or dial which moves to give a reading. 2) a rod used for pointing to features on a map or chart. 3) a hint or tip. 4) a breed of dog that on scenting game stands rigid looking towards it. 5)… … English terms dictionary
Pointer machine — In theoretical computer science a pointer machine is an atomistic abstract computational machine model akin to the Random access machine.Depending on the type, a pointer machine may be called a linking automaton, a KU machine, an SMM, an… … Wikipedia
pointer — Point Point, n. [F. point, and probably also pointe, L. punctum, puncta, fr. pungere, punctum, to prick. See {Pungent}, and cf. {Puncto}, {Puncture}.] 1. That which pricks or pierces; the sharp end of anything, esp. the sharp end of a piercing… … The Collaborative International Dictionary of English
pointer — noun a) Anything that points or is used for pointing. The instructor gave me some pointers on writing a good paper. b) A needle like component of a timepiece or measuring device that indicates the time or the current reading of the device. Syn:… … Wiktionary
pointer — noun 1》 a long, thin piece of metal on a scale or dial which moves to give a reading. ↘a rod used for pointing to features on a map or chart. ↘Computing a cursor. ↘Computing a variable whose value is the address of another variable; a … English new terms dictionary
Speed reading — Jimmy Carter and his daughter Amy participate in a speed reading course … Wikipedia
Finger reading — Finger Fin ger (f[i^][ng] g[ e]r), n. [AS. finger; akin to D. vinger, OS. & OHG. fingar, G. finger, Icel. fingr, Sw. & Dan. finger, Goth. figgrs; of unknown origin; perh. akin to E. fang.] 1. One of the five terminating members of the hand; a… … The Collaborative International Dictionary of English
metaphysics — /met euh fiz iks/, n. (used with a sing. v.) 1. the branch of philosophy that treats of first principles, includes ontology and cosmology, and is intimately connected with epistemology. 2. philosophy, esp. in its more abstruse branches. 3. the… … Universalium
Multimeter — A digital multimeter A multimeter or a multitester, also known as a VOM (Volt Ohm meter), is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter may include features such as the ability … Wikipedia
Caliper — For other uses, see Caliper (disambiguation). A vernier caliper … Wikipedia
