BRL P2808 Ultrasonic Slide Rule

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Country of manufacture: England,            Date of manufacture: ____
Overall length: 18.6,           Width: 6.6 cm,           Weight: 133.9 gms
Materials: plastic (PVC) body and slides
Cursor: 3.5 X 7.4 X 0.6 cms; metal runners holding unframed plastic lens; lines = single line, front only
Scales: 16, specialized
Front: A (Beam Spread) [ B (Crystal Diameter), C (Frequency) ] D (Velocity), E (Wavelength) [ F (α/β Shear), G (α/β Comp.) ] H (material), I (decibels)
Back: [ J (Crystal Diameter), K (Near Zone) ] L (Wavelength), M (Probe Angle) [ N (T, R, and S) ] O (Probe Angle), in./cm.
Gauge Marks: [       ]
Condition: C3-C4 (Very minimal to minimal signs of use)
Came with: original brown leather sheath

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