Sterling Foxboro Flow and Valve Rule

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Country of manufacture: USA, (Sterling Manufacturing Co., Inc., Mansfield, MA),            Date of manufacture: ____
Overall length: 31.5 cm,          Width: 4.5 cm,           Weight: 127.5 gms
Materials: all plastic (PVC?)
Cursor: 3.5 X 5.2 X 0.6, all plastic;   lines: single, front only
Scales: numerous specialized
Front: Pipe Schedule Bars (120, 80, 40, 30), D [ Flange d/D, Pipe d/D, Venturi d/D, Gas Temp.° F, Gas S.G., Differential & Gas Static ] E, State Bar (liquid, steam, gas)
Well/Gutter: Temp. Expansion Correction Factors, Correction Instructions;           Back: Instructions for Use
Slide Back: [ Flange d/D, Pipe d/D, Venturi d/D, P (Steam lbs/sq. in.), G_l or G_f (Liquids), H ]
Condition: C2-C3 (Mint to Very minimal signs of use)
Came with: Original brown leather case, stamped: "Foxboro Flow Rule"

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