a shaft bearing consisting of a number of hardened steel balls which roll in spherical grooves (ball tracks) formed in an inner race fitted to the shaft and in an outer race carried in a housing. Balls are spaced and held by a light metal or plastic cage. Also one of the balls itself.
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DE: der Kugellager [U50637]
FR: roulement ? billes [U50637]
FI: kuulalaakeri [U50637]
This apparatus shall consist of a pendulum whose pivot is supported by ballbearings and whose reduced mass (1) at its centre of percussion is 6 78 kg. The lower extremity of the pendulum shall consist of a rigid headform 165 mm in diameter whose centre is identical with the centre of percussion of the pendulum.
