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.
Rutland (/ˈrʌtlənd/) is a landlocked county in the East Midlands of England, bounded to the west and north by Leicestershire, to the northeast by Lincolnshire and the southeast by Northamptonshire.
Its greatest length north to south is only 18 miles (29 km) and its greatest breadth east to west is 17 miles (27 km). It is the smallest historic county in England and the fourth smallest in the UK as a whole. Because of this, the Latin motto Multum in Parvo or "much in little" was adopted by the county council in 1950. It has the smallest population of any normal unitary authority in England. Among the current ceremonial counties, the Isle of Wight, City of London and City of Bristol are smaller in area. The former County of London, in existence 1889 to 1965, also had a smaller area. It is 323rd of the 326 districts in population.
The only towns in Rutland are Oakham, the county town, and Uppingham. At the centre of the county is Rutland Water, a large artificial reservoir that is an important nature reserve serving as an overwintering site for wildfowl and a breeding site for ospreys.
Rutland's older cottages are built from limestone or ironstone and many have roofs of Collyweston stone slate or thatch.
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