BRL Janus Series N.52 Navigator's Dual Face Slide Rule, Example 2

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Country of manufacture: England,            Date of manufacture: ____
Overall length: 33.4 cm,          Width: 5.5 cm,           Weight: 168.3 gms
Materials: plastic (PVC) stators and slide, glued-on plastic end braces
Cursor: 3.5 X 6.6 X 0.9 cms; metal runners holding unframed plastic lens, adjustable; lines = single line,front and back
Scales: 25, some specialized
Front: Gauge Points, S₁, A [ B, T_A, T_B, ST, S, C ] D, K, L
Back: ICANN Temp, Temperature Conversion (°C to/from °F), Altimeter Correction, P&D Altimeter [ Temp, Air Temp., CI, Density Alt., Temp °C for Mach No., C ] D, SM, KM
Gauge Marks: [ π, C, X_M ]
Condition: C3-C4 (Very Minimal to Minimal signs of use)
Came with: Original blue-green cardboard case, instruction booklet

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