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.
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.
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.
Staffordshire (/ˈstæfərdˌʃɪər, -ʃər/; postal abbreviation Staffs.) is a landlocked county in the West Midlands of England. It borders Cheshire to the northwest, Derbyshire and Leicestershire to the east, Warwickshire to the southeast, West Midlands and Worcestershire to the south, and Shropshire to the west.
The largest settlement in Staffordshire is Stoke-on-Trent, which is administered as an independent unitary authority, separately from the rest of the county. Lichfield, a smaller settlement, is a cathedral city. Other major settlements include Stafford, Burton upon Trent, Cannock, Newcastle-under-Lyme, Rugeley, Leek, and Tamworth.
Smaller towns include Stone, Cheadle, Uttoxeter, Burntwood/Chasetown, Eccleshall, Biddulph, Penkridge and the large villages of Wombourne, Kinver, Tutbury, Alrewas, Barton-under-Needwood, Stretton and Abbots Bromley. Cannock Chase AONB is within the county as well as parts of the National Forest and the Peak District national park.
Wolverhampton, Walsall, West Bromwich and Smethwick are within the historic county boundaries of Staffordshire, but since 1974 have been part of the West Midlands county.
Apart from Stoke-on-Trent, Staffordshire is divided into the districts of Cannock Chase, East Staffordshire, Lichfield, Newcastle-under-Lyme, South Staffordshire, Stafford, Staffordshire Moorlands, and Tamworth.