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Graphical Site Table Slide Rule

L.E. Jones

A 10″ slide rule made of wood and celluloid framed on a wood surface. It is a Mannheim-type slide rule with scales on only one side of the rule. A special feature of this slide rule is that there are scales present on both sides of the slide. In addition, there are tables of information on the frame underneath the slide. There are detailed instructions for use present at the back of the slide rule. The cursor consists of a rectangular plastic piece screwed to two small wooden pieces with ridges for sliding. It does not have a cover. 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.8

Alternative Name:

Primary Materials: Wood, Plastic


Old inventory number = 8. Markings on bottom right of the front of the rule: Oct 61 M 83, FT 105-H-6.

Dimensions (cm):

Length = 36.5 cm, Width = 6.7 cm, Height = 1.9 cm

Function: Facilitating calculations.


Item is in good condition. The plastic surface has warped making it difficult to move the slide.

Associated Instruments:

Manufacturer: Unknown

Date of Manufacture: 1961


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

Additional Information and References:

Historical Notes:


  • Donated to UTSIC