Blundell Harling FC3540 Fisher Controls Universal Valve Sizing Slide Rule (U.S. Units)

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Country of manufacture: England,            Date of manufacture: ____
Overall length: 33.0 cm,          Width: 4.5 cm,           Weight: 77.4 gms.
Materials: All plastic body; glued-on plastic end braces, raised on back side to elevate off working surface
Cursor: 3.5 X 5.0 X 1.1 cms; All plastic, slightly magnifying,   lines: single hairline, front and back
Scales: 17
Front: Side A: ΔP (Pressure Drop), %Q_C2 [Side A: P₁ (Inlet Pressure), gas specific gravity, Temp°, Superheat°, C₁, Q (Steam Flow) ] C_g (Gas) or C_s (Steam), %Q_C1
Back: Side B: ΔP (Liquid Pressure Drop), %Q_C2 [Side B: P₁ (Inlet Pressure), Inlet Density (gas or vapor) or Specific Gravity (liquid), Q (Liquid, or Gas/Vapor flow) ] C_v (Liquid), C_g (Gas or Vapor)
Gauge Marks: [       ]
Condition: C2-C3 (Mint to very minimal signs of use
Came with: Original leather(?) case

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