Jobs
Automatic Door
An automatic door, also known as an auto door, is a door that opens automatically, usually on sensing the approach of a person.
In the 1st century AD, mathematician Heron of Alexandria in Roman Egypt invented the first known automatic door. He described two different automatic door applications. The first application used heat from a fire lit by the city's temple priest. After a few hours atmospheric pressure built up in a brass vessel causing it to pump water into adjacent containers. These containers acted as weights that – through a series of ropes and pulleys – would open the temple's doors at about the time people were to arrive for prayer. Heron used a similar application to open the gates to the city.[1]
In 1931, engineers Horace H. Raymond and Sheldon S. Roby of the tool and hardware manufacturer Stanley Works designed the first model of an optical device triggering the opening of an automatic door. The invention was patented and installed in Wilcox's Pier Restaurant in West Haven, Connecticut for the benefit of waiters carrying plates of food and drink. The entire system plus installation was sold for $100.[2][3]
In 1954, Dee Horton and Lew Hewitt invented the first sliding automatic door. The automatic door used a mat actuator. In 1960, they co-founded Horton Automatics Inc and placed the first commercial automatic sliding door on the market.[4]
Yorkshire (/ˈjɔːrkʃər, -ʃɪər/; abbreviated Yorks), formally known as the County of York, is a historic county of Northern England and the largest in the United Kingdom.[3] Because of its great size in comparison with other English counties, functions have been undertaken over time by its subdivisions, which have also been subject to periodic reform. Throughout these changes, Yorkshire has continued to be recognised as a geographic territory and cultural region.[4] The name is familiar and well understood across the United Kingdom and is in common use in the media and the military,[5] and also features in the titles of current areas of civil administration such as North Yorkshire, South Yorkshire, West Yorkshire and the East Riding of Yorkshire.
Within the borders of the historic county of Yorkshire are large stretches of unspoiled countryside, particularly within the Yorkshire Dales, North York Moors and Peak District national parks.[6] Yorkshire has been nicknamed "God's Own Country".[4][7][8]
The emblem of Yorkshire is the White Rose of the English royal House of York, and the most commonly used flag representative of Yorkshire is the white rose on a blue field[9] which, after nearly fifty years of use, was recognised by the Flag Institute on 29 July 2008.[10] Yorkshire Day, held annually on 1 August, is a celebration of the general culture of Yorkshire, ranging from its history to its dialect.[11]
Yorkshire is covered by different Government Office Regions. Most of the county falls within Yorkshire and the Humber while the extreme northern part of the county, such as Middlesbrough, Redcar, Holwick and Startforth, falls within North East England. Small areas in the west of the county are covered by the North West England region.
