BRL Janus Series HF55 Tarrant Hydraulic Slide Rule

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Country of manufacture: England,            Date of manufacture: ____
Overall length: 33.8 cm,          Width: 4.5 cm,           Weight: 174.7 gms
Materials: plastic (PVC) stators and slide, metal end braces, adjustable
Cursor: 3.5 X 5.6 X 0.9 cms; metal runners holding unframed plastic lens, adjustable; lines = single line,front and back
Scales: 27, specialized
Front: Velocity (M/Sec), Velocity (Ft/Sec) [ Hydraulic Radius (Feet), Hydraulic Radius (Meters), Kutter's "η", Diameter of half-round channel (Feet) ] Slope of Channel, Depth/Diameter, Area/Diameter²
Back: A, Flow (Cu. Meters/Hr), Flow (Cu. Feet/Sec) [ A1/Pipe Diam (inches), Pipe Diam (Meters), Head Lost (Meters), Diameter (Meters), Head Lost (Feet), C1, Diameter (Inches) ] Length of Pipe (Ft), Velocity (Ft/Sec), Length of Pipe (Meters), Velocity (M/Sec), Proportional Flow, Proportional Velocity, Proportional Depth, Proportional Depth
Gauge Marks: [       ]
Condition: C4 (minimal signs of use)
Came with: Instructions, and original cardboard box (labeled: "Tarrant Hydraulic Slide Rule, supplied by Patterson Engineering Company, Limited, Kingsway, London

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