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.
Worcester (/ˈwʊstər/ (About this soundlisten) WUUS-tər) is a cathedral city in Worcestershire, England, 30 miles (48 km) south-west of Birmingham, 101 miles (163 km) west-north-west of London, 27 miles (43 km) north of Gloucester and 23 miles (37 km) north-east of Hereford. The population is about 100,000. The River Severn flanks the western side of the city centre, which is overlooked by Worcester Cathedral. The Battle of Worcester in 1651 was the final one in the English Civil War, where Oliver Cromwell's New Model Army defeated King Charles I's Royalists. Worcester is the home of Royal Worcester Porcelain, composer Edward Elgar, Lea & Perrins, makers of traditional Worcestershire sauce, University of Worcester, and Berrow's Worcester Journal, claimed as the world's oldest newspaper.