ISBN: 978-5-5084-6175-1

ISBN: 978-5-5144-6333-6

High Quality Content by WIKIPEDIA articles! The Ordnance QF 25-pounder Short was an Australian variant of the British Ordnance QF 25-pounder field gun/howitzer. The gun was developed by modifying the 25-pounder`s design to improve its mobility during jungle warfare. Development began in 1942, and the weapon first entered service with the Australian Army the next year. It was used by several Royal Australian Artillery regiments during fighting in the South West Pacific Area, before being declared obsolete in 1946.

ISBN: 978-5-5148-4205-6

High Quality Content by WIKIPEDIA articles! The Ordnance QF 3 pounder Vickers was a British artillery piece first tested in Britain in 1910. It was used on Royal Navy warships. It was more powerful than and unrelated to the older QF 3 pounder Hotchkiss, with a propellant charge approximately twice as large, but it initially fired the same Lyddite and Steel shells as the Hotchkiss.

ISBN: 978-5-5111-1165-0

High Quality Content by WIKIPEDIA articles! The Ordnance QF 75 mm, abbreviated to OQF 75 mm, was a British tank-gun of the Second World War. It was used instead of the Ordnance QF 6 pounder ("6 pdr"), an anti-tank gun, to give better performance against infantry targets in a similar fashion to the 75 mm gun fitted to the American Sherman tank. The QF came from "quick-firing". The gun was also sometimes known as ROQF from Royal Ordnance (the manufacturer) Quick-Firing.

ISBN: 978-5-5111-1195-7

High Quality Content by WIKIPEDIA articles! The Ordnance QF 2-pounder (or simply "2 pounder gun") was a 40 mm (1.575 in) British anti-tank and vehicle-mounted gun, employed in the Second World War. It was actively used in the Battle of France, and during the North Africa campaign. As tanks became sufficiently armoured to stand up to its shots, it was gradually replaced by the 6-pounder, starting in 1942, though some remained in service until the end of the war. In its vehicle-mounted variant, the 2-pounder was also a common main gun on British tanks early in World War II, and was a typical main armament of armoured cars such as the Daimler throughout the war.

ISBN: 978-5-5111-1124-7

High Quality Content by WIKIPEDIA articles! The Ordnance QF 25 pounder, or more simply, 25-pounder or 25-pdr, was introduced into service just before World War II, during which it served as the major British field gun/howitzer. It was considered by many to be the best field artillery piece of the war, combining high rates of fire with a reasonably lethal shell in a highly mobile piece. It was the British Army`s primary artillery field piece well into the 1960s, with smaller numbers serving in training units until the 1980s. Many Commonwealth of Nations countries used theirs in active or reserve service until about the 1970s and ammunition for the weapon is currently being produced by Pakistan Ordnance Factories.

ISBN: 978-5-5111-1188-9

High Quality Content by WIKIPEDIA articles! The Ordnance QF 18 pounder, or simply 18-pounder Gun, was the standard British Army field gun of the World War I era. It formed the backbone of the Royal Field Artillery during the war, and was produced in large numbers. It was also used by British and Commonwealth Forces in all the main theatres, and by British troops in Russia in 1919. Its calibre (84 mm) and hence shell weight were greater than those of the equivalent field guns in French (75 mm) and German (77 mm) service. It was generally horse drawn until mechanisation in the 1930s.

ISBN: 978-5-5132-6456-9

High Quality Content by WIKIPEDIA articles! The Ordnance Quick-Firing 17 pounder (or just 17 pdr) was a 76.2 mm (3 inch) gun developed by the United Kingdom during World War II. It was used as an anti-tank gun on its own carriage, as well as equipping a number of British tanks. It was the most effective Allied anti-tank gun of the war. Used with the APDS shot it was capable of defeating all but the thickest armour on German tanks. It was used to `up-gun` some foreign-built vehicles in British service, notably the Sherman Firefly, giving British tank units the ability to hold their own with their German counterparts. In the anti-tank role it was replaced by the 120 mm BAT recoilless rifle after the war. As a tank gun it was succeeded by...

ISBN: 978-5-5118-1526-8

High Quality Content by WIKIPEDIA articles! In human–computer interaction, an organic user interface (OUI) is a user interface with interaction techniques that use the physical shape and position of a device to control it. Organic interfaces may have displays in forms other than a flat sheet, may actively or passively change shape via analog physical inputs, and are characterized by their ability to use the display as an input device. OUIs are intended to be operated through direct manipulation of the device with natural gestures, rather than through a point-and-click interaction.

ISBN: 978-5-5124-0271-9

ISBN: 978-5-5086-1417-1

High Quality Content by WIKIPEDIA articles! An orienteering map is a map specially prepared for use in orienteering competitions. It is a topographic map with extra details to help the competitor navigate through the competition area.

ISBN: 978-5-5144-9052-3

High Quality Content by WIKIPEDIA articles! The United States Congress authorized the original six frigates of the United States Navy with the Naval Act of 1794 on 27 March 1794 at a total cost of $688,888.82. These ships were built during the formative years of the United States Navy, on the recommendation of designer Joshua Humphreys for a fleet of frigates powerful enough to engage any frigates of the French or British navies yet fast enough to evade any ship of the line.

ISBN: 978-5-5093-8185-0

High Quality Content by WIKIPEDIA articles! The Original Chip Set (OCS) was a chipset used in the earliest Commodore Amiga computers and defined the Amiga`s graphics and sound capabilities. It was succeeded by the slightly improved Enhanced Chip Set (ECS) and greatly improved Advanced Graphics Architecture (AGA).

ISBN: 978-5-5119-3211-8

High Quality Content by WIKIPEDIA articles! ORP Burza (English: Thunderstorm) was a Wicher-class destroyer of the Polish Navy which saw action in World War II.

ISBN: 978-5-5111-1288-6

High Quality Content by WIKIPEDIA articles! ORP Piorun was an N-class destroyer used by the Polish Navy during the Second World War. The name is Polish for "Thunderbolt".

ISBN: 978-5-5111-1289-3

High Quality Content by WIKIPEDIA articles! ORP Wicher, the lead ship of the Wicher class, was a Polish Navy destroyer. She saw combat in the Invasion of Poland, which began World War II in Europe. The destroyer was sunk by German bombers on 3 September 1939.

ISBN: 978-5-5111-1296-1

ISBN: 978-5-5126-5179-7

High Quality Content by WIKIPEDIA articles! An orrery is a mechanical device that illustrates the relative positions and motions of the planets and moons in the Solar System in a heliocentric model. Though the Greeks had working planetaria, the first orrery that was a planetarium of the modern era was produced in 1704, and one was presented to the Earl of Orrery — whence the name came. They are typically driven by a clockwork mechanism with a globe representing the Sun at the centre, and with a planet at the end of each of the arms.

ISBN: 978-5-5111-2410-0

High Quality Content by WIKIPEDIA articles! Orvis is a family-owned retail and mail-order business specializing in high-end fly fishing, hunting and sporting goods. Founded in Manchester, Vermont in 1856 by Charles F. Orvis to sell fishing tackle, the company has changed hands only twice and has had only five CEOs in its 150-year history. Characterized by the leading fly-fishing trade journal as an "800-pound gorilla" in the fly-fishing industry, Orvis is recognized for its "unparalleled influence on the sport" and outstanding customer service. Orvis is the oldest mail-order retailer in the United States.

ISBN: 978-5-5139-1303-0

High Quality Content by WIKIPEDIA articles! OS X Server, formerly Mac OS X Server, was a separately sold Unix server operating system from Apple Inc. architecturally identical to its desktop counterpart OS X—with additional server programs and management and administration tools. As of version 10.7 (Lion), Mac OS X and Mac OS X Server were combined into one release and re-branded as OS X. A separate "server" operating system is no longer sold; the server-specific server applications and work group management and administration software tools from Mac OS X Server are now offered as Server App, an add-on package for OS X sold through the Mac App Store along with Server Admin Tools 10.7, available from the Apple support web site.

ISBN: 978-5-5087-0019-5

High Quality Content by WIKIPEDIA articles! The Project 205 Moskit (mosquito) more commonly known by their NATO reporting name Osa, are a class of missile boats developed for the Soviet Navy in the late 1950s. Until 1962 has been classified as a large torpedo boat. The Osas are probably the most numerous class of missile boats ever built, with over 400 vessels constructed in 1960-1973 for both the Soviet Navy and for export to allied countries. "Osa" means "wasp" in Russian, but it is not an official name. The boats were designated as "large missile cutters" in the Soviet Navy.

ISBN: 978-5-5148-9812-1

ISBN: 978-5-5085-6952-5

High Quality Content by WIKIPEDIA articles! This article discusses the history and gradual development of the Oscilloscope.

ISBN: 978-5-5082-4553-5

High Quality Content by WIKIPEDIA articles! This is a subdivision of the Oscilloscope article, discussing the various types and models of oscilloscopes in greater detail.

ISBN: 978-5-5092-2323-5