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]
The East Midlands is one of nine official regions of England at the first level of NUTS for statistical purposes. It consists of Derbyshire, Leicestershire, Lincolnshire (except North and North East Lincolnshire), Northamptonshire, Nottinghamshire and Rutland.
The region has an area of 15,627 km2 (6,034 sq mi), with a population over 4.5 million in 2011. The most populous settlements in the region are Derby, Leicester, Lincoln, Mansfield, Northampton and Nottingham. Other notable settlements include Boston, Chesterfield, Corby, Grantham, Hinckley, Kettering, Loughborough, Newark-on-Trent, Skegness, Wellingborough, and Worksop.
Relative proximity to London and its position on the national motorway and trunk road networks help the East Midlands to thrive as an economic hub. Nottingham and Leicester are each classified as a sufficiency-level world city by the Globalization and World Cities Research Network.[2]
The region is primarily served by East Midlands Airport, which lies between Derby, Loughborough and Nottingham.
