Dietzgen 1798 Dempster Model AA RotaRule

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Country of manufacture: USA,            Date of manufacture: ____,       Ser. No.: 1206
Diameter: 13.0 cm,      Weight: 120.2 gms
Materals: plastic
Cursor: two-sided plastic, one line on front, one on back; scales labeled in red
Scales: 26
Front: K, A, D [ C, CI. CIF, sin^-1, cos^-1, tan^-1sin^-1, cot^-1cos^-1, tan^-1, cot^-1, Stadia (Gv & Gh), B, F/i]
Back: Long D (unmarked), DLL, V2 [ V1, Long C (unmarked), LL3, LL2, LL1, LL%, L]
Gauge Marks: [ π, ρ'', ρ', ]
Condition: C3 (Very minimal signs of use)
Came with: Original brown leather case embossed "Eugene Dietzgen Company, Distributers, Chicago, New York", magnifier

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