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RAF aircrew with one of their Bristol Beaufighters on a PSP airstrip at Biferno, Italy, August 1944. Marston Mat, more properly called pierced (or perforated) steel planking (PSP), is standardized, perforated steel matting material developed by the United States at the Waterways Experiment Station shortly before World War II, primarily for the rapid construction of temporary runways and ...
The Pelican Stairs next to the Prospect of Whitby pub in Wapping. Watermen's stairs were semipermanent structures that formed part of a complex transport network of public stairs, causeways and alleys in use from the 14th century to access the waters of the tidal River Thames in England.
A metal safety rail has been added to the outside of this cantilevered stone staircase. A cantilever is a beam , which is anchored at only one end. Thus cantilevered stairs have a "floating" appearance, and they may be composed of different materials, such as wood , glass , stone , or stainless steel .
An intermediate landing is a small platform that is built as part of stairs between main floor levels and is typically used to allow the stairs to change directions, or to allow the user a rest. A half landing, or half-pace, is where a 180° change in direction is made, and a quarter landing is where a 90° change in direction is made (on an ...
With 12.2% of Americans struggling to walk or climb stairs, a stair lift can make a major difference in accessibility at home. Those who face mobility issues, such as seniors, people recovering ...
Rolls of Sommerfield tracking can be seen in the foreground during a landing exercise at Slapton Sands, Devon, England, April 1944. Sommerfeld tracking , named after German expatriate engineer, Kurt Joachim Sommerfeld, [ 1 ] [ 2 ] then living in Cambridge, England, was a lightweight wire mesh type of prefabricated airfield surface.
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