MARK IV (software)
MARK IV is a Fourth-generation programming language that was created by Informatics, Inc. (later, Sterling Software) in the 1960s. Informatics, Inc. took advantage of IBM's decision to unbundle their software; MARK IV was the first "software product to have cumulative sales of $10 million".
MARK IV was developed for IBM Systems (360 and 370) and for the RCA Spectra 70. Its main benefit was allowing faster application development on the order of 6 to 10 times faster than doing a system using a 3GL, such as COBOL. MARK IV, being an early 4GL, allowed user development of systems related to business. In an 1971 ad by Informatics, there are several quotes from customers, such as:
MARK IV (as VISION:BUILDER) is now part of the product suite from Computer Associates.
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Mark IV
Mark IV or Mark 4 often refers to the fourth version of a product, frequently military hardware. "Mark", meaning "model" or "variant", can be abbreviated "Mk."
Mark IV or Mark 4 can specifically refer to:
In technology
In military and weaponry
Mark IV tank
The Mark IV (pronounced "Mark Four") was a British tank of World War I. Introduced in 1917, it benefited from significant developments on the first British tank, the intervening designs being small batches used for training. The major improvements were in armour, the re-siting of the fuel tank, and easier transportation. A total of 1,220 were built: 420 "Males", 595 "Females" and 205 Tank Tenders (unarmed vehicles used to carry supplies), which made it the most produced British tank of the War.
The Mark IV was first used in mid 1917 at the Battle of Messines Ridge. It remained in official British service until the end of the War, and a small number served briefly with other combatants afterwards.
Development
The director of the Tank Supply Department, Albert Gerald Stern, first intended to fit the Mark IV with a new engine and transmission. Production of battle tanks was halted until the new design was ready, necessitating the use of the Mark II and III as interim training tanks. Failing to complete development soon enough to start production in time to have 200 tanks ready for the promised date of 1 April 1917, Stern was ultimately forced to take a Mark IV into production in May 1917 that was only slightly different from the Mark I tank.
Avid Flyer
The Avid Flyer is a family of American single engine, high-wing, strut-braced, conventional landing gear-equipped, two seat ultralight aircraft designed for kit construction in the 1980s. Its several variants sold in large numbers. In 1987 a Flyer became the first ultralight to land at the North Pole.
Design and development
The kitbuilt two seat lightplane was designed by Dean Wilson in 1983, the first prototype flying in 1983 and appearing at Oshkosh that year. Kits were produced by Light Aero with several names (Bandit, Lite, Magnum and Mk.IV) with many options including two wing designs, the choice of tricycle, tailwheel, ski or float undercarriages, rescue parachutes and a variety of engines. Lite Aero production continued until the company went bankrupt in 1998. Avid Aircraft reappeared in 2003, but by 2010 the kits, including new variants, and components were produced by Airdale Flyer.
The Avid Flyer is a conventional layout, single engine, side by side two seat light aircraft, with a strut-braced high wing configuration. Aluminum tubes serve as leading edge/main spar and rear spar, each wing being supported by a pair of tubular lift struts. Sawn plywood wing ribs are bonded to the aluminum tube spars using a filled epoxy compound. The Avid Flyer features Junkers style one-piece flaperons supported by three offset hinge arms. The Junkers design moves the control surfaces well underneath the wing, where they remain in undisturbed smooth airflow at low speed and/or higher climb angles.
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