Set of two picket plates as follows: Instrument For The Measurement Of Angles used with the Fraction Circles to show how angles are measured in levels. The Centisimal Body used with the Fraction Circles to show how fractions could also be decreased to decimal fractions.
Set of two picket plates as follows: Instrument For The Measurement Of Angles used with the Fraction Circles to show how angles are measured in levels.
The Centisimal Body used with the Fraction Circles to show how fractions could also be decreased to decimal fractions.
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