Mercury Swivel Commutator



A mercury swivel commutator is a historical electrical device that was used to transfer electrical current between a stationary circuit and a rotating one. It functioned by utilizing liquid mercury to make electrical contact between the two circuits.

Here are some key points from the article:

Function: Transferred electrical current between a stationary circuit and a rotating circuit.
Operation: Used liquid mercury to make electrical contact.   
Historical Significance: An important component in early electrical machines, such as dynamos and motors.
Limitations: Mercury is a hazardous material, and mercury swivel commutators posed environmental and health risks.   
Replacement: Have been largely replaced by more modern technologies such as slip rings and brushes, which do not use liquid mercury.

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