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from simple multiplication to division of decimals to the rule of three
then the straight ends were inserted one by one into the face of the "brush
I can never resist an archeress
it's pretty fabulous chalk--definitely incentive to find an old slate chalkboard if one doesn't have on already
Satisfying Old Brass Pin Drill Gauge gold hearts from simple multiplication to divisionI believe this small brass gauge would have been used for measuring pin drill (pin vise) bits; pin drills are like miniature drills, used for precision work by machinists or jewelers, etc. This is a fairly old one, with just the center row of holes stamped: 0 10 in progression, the largest number for the smallest hole. The shape of it when I first saw it made me think of a hornbook (a small paddle of sorts, usually bearing an alphabet, used for
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