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ประตูหมุน [Turnstile] 
| Turnstile |
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A turnstile, also called a baffle gate, is a form of gate which allows one person to pass at a time. It can also be made so as to enforce one-way traffic of people, and in addition, it can restrict passage to people who insert a coin, a ticket, a pass, or similar. Thus a turnstile can be used in the case of paid access (sometimes called a faregate when used for this purpose), for example public transport as a ticket barrier or a pay toilet, or to restrict access to authorized people, for example in the lobby of an office building. Turnstiles were originally used, like other forms of stile, to allow human beings to pass whilst keeping sheep or other livestock penned in. Turnstiles often use ratchet mechanisms to allow the rotation of the stile in one direction allowing ingress but preventing rotation in the other direction. They are often designed to operate only after a payment has been made, usually by inserting a coin or token in a slot; or by swiping, or inserting, a paper ticket or electronically encoded card. Turnstiles are often used for counting the numbers of people passing through a gate, even where payment is not involved. They are used extensively in this manner in amusement parks, in order to keep track of how many people enter and exit the park and ride each ride. The first major use of turnstiles at a sporting venue was at Hampden Park in Glasgow, Scotland. It is common for entry to public lavatories in the United Kingdom to be controlled by turnstiles. The High Entrance/Exit Turnstile (HEET), a larger version of the turnstile, similar in operation to a revolving door, is known as an "iron maiden", after the medieval torture device of the same name, or as "high-wheel".[1] It is sometimes called a "Rotogate", especially in Chicago, where they are used at unstaffed exits of their El stations.[2] In Europe, however, "Rotogate" refers to a different kind of gate that is not a turnstile.
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