<Tr> <Td_colspan="2"> The London Eye's 32 ovoidal air - conditioned passenger capsules each weigh 10 tonnes (11 short tons) and can carry 25 people </Td> </Tr> <P> Observation wheel is an alternative name for Ferris wheel . In 1892, when the incorporation papers for the Ferris Wheel Company (constructors of the original 1893 Chicago Ferris Wheel) were filed, the purpose of the company was stated as: (construction and operation of) "...wheels of the Ferris or other types for the purpose of observation or amusement". </P> <P> Some Ferris wheels are marketed as observation wheels, any distinction between the two names being at the discretion of the operator, however the wheels whose operators reject the term Ferris wheel are often those having most in common with the original 1893 Chicago Ferris Wheel, especially in terms of scale and being an iconic landmark for a city or event . </P> <P> Wheels with passenger cars mounted external to the rim and independently rotated by electric motors, as opposed to wheels with cars suspended from the rim and kept upright by gravity, are those most commonly referred to as observation wheels, and their cars are often referred to as capsules . However, these alternative names are also sometimes used for wheels with conventional gravity - oriented cars . </P>

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