Nestler 21 Darmstadt

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Country of manufacture: Germany,            Date of manufacture: ____
Overall length: 29.6 cm,          Width: 3.8 cm,           Overall Thickness (including cursor): 1.5 cm,          Weight: 87.5 gms
Materials: Closed form simplex; celluloid lamimate over mahogany
Cursor: 4.2 X 3.5 X 1.3 cms; metal framed glass lens; plastic indicator on bottom edge; highlighted index on top;   lines = 3 hairlines on front face, 1 on bottom edge; 1 on top.
Scales: 14, extensions on A, B, C, CI, D
Front: 27 cm, lg // K, A [ B, CI, C ] D, √(1-x²) || sin, tg
Slide Back: [LL1, LL2, LL3]
Well: nothing
Gauge Marks: [π, e, ρ^'', ρ^', ρ_,, ]
Back: Instructions for use, Mathematical Constants, Conversion Factors
Condition: C5 (Signs of Normal use)
Came with: partial black cardboard case

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