bobbing compound - A tripoli-like compound that is used as an abrasive before polishing.
Boley gauge - A Vernier slide gauge of light construction convenient for use by watchmakers and jewelers ...
Bobbing Compound: A tripoli type compound used as a fine abrasive before polishing.
Brass: An alloy metal composed of various proportions of copper and zinc- an average formula is 65 parts copper and 35 parts zinc.
 See also: Channel, Glass, Dial, Case, Automatic
  
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