Willsonn Pipeline Computer

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Country of manufacture: USA,            Date of manufacture: abt. 1968
Diameter: 19.1 cm,      Weight: approx. 54.3 gms
Materials: All plastic
Cursor: all plastic, two sided; one line on front and two on back
Scales: numerous specialized
Front: Hourly (flow) rates, Daily rates [ Length (miles), C-scale, Length (feet) Pipe Diameter ] Diff btw. Squares of the Absolute Inlet and Outlet Pressures [ Diameter (D⁵-scale), Friction Factor, Gravity Scale, Z-scale, Deviation Factor
Back: graphs for Friction Factor, Inlet Pressures for Low Pressure Section, Inlet Pressures for High Pressure Section
Condition: C7 (cursor is broken at one end; still usable)
Came with: Cardboard folder which serves as a case for the rule and holds instruction booklet

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