Perrygraf ARMCO Sewer Pipe Calclator

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Country of manufacture: USA,            Date of manufacture: => 1957
Overall length: 26.7 cm,          Width: 9.1 cm.,           Weight: 60.0 gms.
Materials: Heavy stock cardboard and plastic
Cursor: 10.1 X 9.3 X 0.4 cms; All-plastic, wrap-around; lines = Scales 'A' ("Parts Full") and 'B' ("Manning's 'n'") on front; nothing on back
Scales: 7, specialized
Front: C (Slope in ft. per ft.), D (Velocity in ft. per sec.) [ E (Parts Full), F (Diameter in inches) ] [ I (Diameter in Inches), G (Parts Full) ] H (Discharge in Cu. Ft. per Sec.)
Back: Instructions for Use and Table of Wetted Area, Perimeter, and Hydraulic Radius.
Condition: C4-C5 (Minimal to normal signs of use)
Came with: Nothing

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