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Universal Valve Sizing Rule

L.E. Jones

A 10″ slide rule with a light green surface (Pickett’s special “eyesaver” design). It is housed in a black coloured sleek leather case. The aluminum body has a grooved slide and aluminum stops. It is a duplex slide rule with scales on both sides. The unframed glass cursor attaches to the frame by means of plastic and does not have grooves or ridges but slides smoothly over the surface of the frame. The cursor lens aids visualization because it has a convex glass on both sides of the rule. Scales: Front: Delta P (liquid pressure drop, psi), %QC2 (C2 obtained from body style), P1 (inlet pressure, psig), Inlet density lb/ft3 for gas or vapour or specific gravity of liquid Q (flow rate, scfh), Cv for liquid, Cg for gas. Back: Delta P (pressure drop for gas or steam, psi), %QC2, P1 (inlet pressure, psig), gas specific gravity, Temperature (F), Superheat (F), C1, Flow Q ( scfh for gas and thousands of lb/hr for steam), Cg for gas and Cs for steam, %QC1.

Accession Number: 2010.lej.9

Alternative Name:

Primary Materials: Metal, Plastic, Glass


Old inventory number = 9. On one end of one side is the Fisher logo followed by “Universal Valve Sizing Rule”. On the other side, the end is marked “Copyright 1967” at the top. To the left of this is the Fisher Controls logo followed by “Fisher Governor Company / Marshalltown, Iowa, USA / and / Continental Equipment Co. Division / Corapolis, Penna., U. S. A. Pickett Model 1041-G”.

Dimensions (cm):

Height = 0.9, Width = 4.4, Length = 30.8

Function: For facilitating calculations.

Condition: Item is in very good condition.

Associated Instruments:


Pickett Inc., Santa Barabara, California, 93102 and Fisher Governor Company, Marshalltown, Iowa, USA

Date of Manufacture: 1961


Part of the L. E. Jones slide rule collection.

Additional Information and References:

Historical Notes:


  • Donated to UTSIC