a pivoted axle or shaft on which the balance is mounted.
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How to use balance staff in a sentence
The ends of the balance staff are made very small so as to form very delicate pivots which turn in jewel bearings.The Wonder Book of Knowledge | Various
The small circle at A represents the center of the pallet staff, and the one at B the center of the balance staff.
It will be seen the impulse roller is staked flat against the hub E of the balance staff.
Our advice is to set both stones in places corresponding to the axis of the balance staff, and the escape-wheel mobiles.
In these frictional escapements the balance staff locked the train while the balance performed its arc of vibration.