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White arrow heads across the width of the runway just prior to the displaced threshold bar A 10 feet (3.0 m) wide white threshold bar across the width of the runway at the displaced threshold Runway 29L at Indira Gandhi International Airport , in Delhi , India, has a displaced threshold of 1,460 m (4,790 ft) from the physical beginning of the ...
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Lining bars have a tapered form. They often have a square cross section between one and 1-1/2 inches at one end. They may have a pyramidal, wedge, or pinch point. They transition to a tapered round cross section 12 to 18 inches from the point. The handle end may terminate in a ball or may be cut off squarely at 5/8 to 3/4 inch diameter.
In the United States they are typically fabricated from 21-foot (6.4 m) sections of 1.5-inch (38 mm) nominal diameter, 1.9-inch (48 mm) outside diameter, schedule 40 steel pipe that are spliced together (with internal pipe sleeves and bolts) to provide a continuous member that stretches the width of a stage. Schedule 80 pipe is also used.
Transom windows which could be opened to provide cross-ventilation while maintaining security and privacy (due to their small size and height above floor level) were a common feature of apartments, homes, office buildings, schools, and other buildings before central air conditioning and heating became common beginning in the early-to-mid 20th century.
Yett hanging in the main entrance of Blackness Castle, Scotland, showing attached bolts and pierced construction.Wrought in 1693. [1]A yett (from the Old English and Scots language word for "gate") [2] is a gate or grille of latticed wrought iron bars used for defensive purposes in castles and tower houses. [3]
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