The beam steps 17ft lengthy, 4ft high and 4in wide. It is covered with plastic or fabric and it is made from wood padded with foam rubber. A gymnast will approach the beam through the board or flooring while the exercise must last from 70 to 90 seconds. She will use two static holds on ray. (sport: Women's Gymnastics)
a gymnastic device used by ladies gymnasts
A counterpoise was placed on the solenoid end of the balance beam to act against the attraction of the solenoid, the position of the counterpoise determining the length of the arc in the crucible.