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balance staff

noun, Horology
a pivoted axle or shaft on which the balance is mounted.
Origin of balance staff
1880-85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for balance-staff
Historical Examples
  • The roller being fastened to the balance-staff, of course, turns just as the balance turns and with it the jewel-pin.

    Time Telling through the Ages Harry Chase Brearley

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