Aqueduct

Aqueduct may refer to:

A type of bridge

A type of water supply system

In anatomy

In businesses

In geography

Skopje Aqueduct

The Skopje Aqueduct (Macedonian: Скопски аквадукт) is an aqueduct and archaeological site located in the village of Vizbegovo 2 km (1.2 mi) northwest from Skopje, Macedonia. The Skopje Aqueduct is the only aqueduct in Macedonia, and one of three largest and well preserved in the former Yugoslavia along with Diocletianus Aqueduct near Split, Croatia and Bar Aqueduct in Montenegro.

The question of when the Skopje Aqueduct was built is unclear. There are three theories:

This aqueduct was in use until the eighteenth century. Only about 386 meters (1,266 ft) with 55 arches of this structure of stone and brick remain. It is assumed that the aqueduct took water from the spring Lavovec (village Gluvo in mountain Skopska Crna Gora), 9 kilometers (5.6 mi) northwest from Skopje and brought water to city center.

Roman aqueduct

The Romans constructed numerous aqueducts in order to bring water from distant sources into cities and towns, supplying public baths, latrines, fountains and private households. Waste was removed by complex sewage systems and released into nearby bodies of water, keeping the towns clean and free from effluent. Aqueducts also provided water for mining operations, milling, farms and gardens.

Aqueducts moved water through gravity alone, being constructed along a slight downward gradient within conduits of stone, brick or concrete. Most were buried beneath the ground, and followed its contours; obstructing peaks were circumvented or, less often, tunnelled through. Where valleys or lowlands intervened, the conduit was carried on bridgework, or its contents fed into high-pressure lead, ceramic or stone pipes and siphoned across. Most aqueduct systems included sedimentation tanks, sluices and distribution tanks to regulate the supply at need.

Rome's first aqueduct supplied a water fountain sited at the city's cattle market. By the third century AD, the city had eleven aqueducts, sustaining a population of over a million in a water-extravagant economy; most of the water supplied the city's many public baths. Cities and municipalities throughout the Roman Empire emulated this model, and funded aqueducts as objects of public interest and civic pride, "an expensive yet necessary luxury to which all could, and did, aspire.":)

Tension

Tension may refer to:

Science

Music

Albums

Songs

Entertainment

Other uses

Tension (geology)

In geology, the term "tension" refers to a stress which stretches rocks in two opposite directions. The rocks become longer in a lateral direction and thinner in a vertical direction. One important result of tensile stress is jointing in rocks. However, tensile stress is rare because most subsurface stress is compressive, due to the weight of the overburden.

Jointing

Tensile stress forms joints in rocks. A joint is a fracture that forms within a rock, whose movement to open the fracture is greater than the lateral movement that takes place. Joints are formed in the direction perpendicular to the least principal stress, meaning that they are formed perpendicular to the tensile stress. One way in particular that joints can be formed is due to fluid pressure, as well as at the crest of folds in rocks. This occurs at the peak of the fold or due to the fluid pressure because a localized tensile stress forms, eventually leading to jointing. Another way in which joints form is due to the change in the weight of the overburden. Since rocks lay under a great deal of overburden, they undergo high temperatures and high pressures. Over time, the rocks are eroded and the weight of the overburden is lifted, so the rocks cool and are under less pressure, which causes the rock to change shape, often forming breaks. As the compression is lifted from the rocks, they are able to react to the tension on them by forming these breaks, or joints.

Gauge (knitting)

In knitting, the word gauge is used both in hand knitting and machine knitting; the latter, technical abbreviation GG, refers to "Knitting Machines" fineness size. In both cases, the term refers to the number of stitches per inch, not the size of the finished garment. In both cases, the gauge is measured by counting the number of stitches (in hand knitting) or the number of needles (on a knitting machine bed) over several inches then dividing by the number of inches in the width of the sample.

Gauge on knitting machines

There are two types of classification of Knitting Gauges or Unit of Measure: