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A jack arch, and a jack arch with a relieving arch above, as illustrated in the Lexikon der gesamten Technik The Mardin jack arch, view from the crypt underneath. A jack arch is a structural element in masonry construction that provides support at openings in the masonry.
A jack post (telepost, adjustable steel column) is a steel post used in the construction trades for temporary support of ceilings, walls and trenches ().They are designed to be able to mechanically telescope to about twice their shortest length in order to span a wide variety of spaces.
A crawl space or crawlspace is an unoccupied, unfinished, narrow space within a building, between the ground and the first (or ground) floor. The crawl space is so named because there is typically only enough room to crawl rather than stand; anything larger than about 1 to 1.5 metres (3 ft 3 in to 4 ft 11 in) and beneath the ground floor would ...
Animation of a strand jack. Strand jacks can be used horizontally for pulling objects and structures, and are widely used in the oil and gas industry for skidded loadouts. Oil rigs of 38,000 t have been moved in this way from the place of construction on to a barge. Since multiple jacks can be operated simultaneously by hydraulic controllers ...
In breakwater applications, A-Jacks can be an economical alternative to quarried rock, which can be both heavier and unwieldy; over the course of a breakwater construction project, the number of transportation cycles to deliver product to the site can be reduced substantially, since A-Jacks are delivered flat on trucks whereas rock rip-rap ...
The most embarrassing loss of the 2024 season. I’m sure there are plenty of contenders, and perhaps I’m overreacting to the most recent piece of data, but the Colts dropping this Week 17 game ...
Jack Markow (1905–1983) was an American cartoonist who also wrote instructional books about cartooning, comic strips and comic art. For three years, he was the cartoon editor of Argosy. Born in London, Markow was a New Yorker from the age of two. He took art courses at the High School of Commerce (later Louis D. Brandeis High School), where ...
Though legions of fans might revisit 1990’s Home Alone (and 1992’s Home Alone 2: Lost in New York) every year, the fictional McCallister kids haven’t gotten back together in thirty years ...