Geidse
O Uicipeid
1. Air Rathad-iarainn is e tha anns an geids ach an astar eadar an dà ghad.
2. Airson Teud is e a tha anns an geids tomhais air tarsuinnead na teud, mar is tric a reir scala arbritary don ainm an "Standard Wire Gauge".
