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.
The Metropolitan Borough of Bolton /ˈboʊltən/ (About this soundlisten) is a metropolitan borough of Greater Manchester, England, named after its largest town, Bolton, but covering a far larger area which includes Blackrod, Farnworth, Horwich, Kearsley, Westhoughton, and part of the West Pennine Moors. It has a population of 276,800.
The boundaries were set by the Local Government Act 1972, and cover eight former local government districts; seven Urban Districts from the administrative county of Lancashire, and the County Borough of Bolton. The metropolitan districts of Bury, Salford and Wigan lie to the east, south and west respectively; and the unitary authority of Blackburn with Darwen and the non-metropolitan district of Chorley in Lancashire to the north and north-west.