Shanghai Open Channel Hydraulic Slide Rule

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Country of manufacture: China,            Date of manufacture: ____
Overall length: 39.8 cm,          Width: 5.6 cm,           Weight: 136.0 gms
Materials: all plastic, glued on plastic end braces.
Cursor: 3.8 X 6.7 X 1.1 cms; all plastic, slightly magnifying, adjustable; lines = single line, front and back
Scales: 30, some specialized
Front: K, A, LL01, LL02, LL03, DF ] CF, CIF, T, ST, S, CI, C ] D, LL3, LL2, LL1
Back: b_w, R^2/3, A' [ A, β_R, β_W, b_g, ι, η, b_v ] QVRWb_r, β_g, β_v
Gauge Marks: [ π, e, e^-1, ρ" (2063), ρ' (3438)]
Condition: C6 (Rule is C4 or C5, but both cursor widows have been solvent damaged; can possibly be restored or improved by careful polishing with very high grit abrasive)
Came with: Original blue plastic slipcase

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