Editing Slip ring (section)

=== Mercury-wetted slip rings ===
[[Mercury (element)|Mercury]]-wetted slip rings, noted for their low resistance and stable connection use a different principle which replaces the sliding brush contact with a pool of liquid metal molecularly bonded to the contacts.<ref>{{cite web|url=http://www.mercotac.com |title=mercotac}}</ref> During rotation the liquid metal maintains the electrical connection between the stationary and rotating contacts. However, the use of mercury can pose safety concerns if not properly handled, as it is a toxic substance. The slip ring device is also limited by temperature, as mercury solidifies at approximately -40&nbsp;°C.<ref>{{cite web|url=http://www.moog.com/products/slip-rings/slip-rings-faq-s/ |title=Frequently Asked Slip Ring Questions |publisher=Moog.com |date=2009-06-23 |access-date=2011-09-02}}</ref>