Satisfying Old Brass Pin Drill Gauge gold hearts from simple multiplication to division

from simple multiplication to division of decimals to the rule of three

pastel on card

not really detracting I don't think but worth noting

Box closed measures 9 1/2" x 5 3/4" x 2 1/2"

and ever--what a marvelous combination of functional form and exuberant expression

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