Unique Ten-Twenty

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Country of manufacture: England,            Date of manufacture: ____
Overall length: 30.0 cm,          Width: 3.6 cm,           Weight: 59.3 gms
Materials: printed paper scales laminated onto boxwood body and slide
Cursor: 2.7 X 4.8 X 0.6 cms; plastic runners holding plastic lens; lines = single line, front only
Scales: 3, the A, C, and D scales are each doubled
Front: A1, D1 [ C1 C2 ] D2 A2
Well: Decimal Equivalents of fractions
Back: Mensuration formulae, Conversion Factors, Atomic Wts., General Data, Properties of Materials
Gauge Marks: [ π ]
Condition: C2-C3 (Mint to Very minimal signs of use)
Came with: Original dark blue cardboard box/case

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