Climatemaker Heat Loss Calculating Slide Rue

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Country of manufacture: USA,            Date of manufacture: ____
Overall length: 33.0 cm,          Width: 6.0 cm,           Weight: 155.2 gms
Materials: plastic laminate over wood; aluminum end braces, adjustable
Cursor: 3.1 X 7.7 X 1.4 cms; wood and plastic, adjustable; lines = single hairline, front & back
Scales:
Front: Forced Air Heating Systems (stack size, pipe size, pipe area, CFM), BTU [Loss Factors 22-40, Temp. Diff., Single Glass Factors, Storm Window Factors] 200° Gravity Heating Systems {First Floor (Pipe Area, Pipe Size), Second Floor (Pipe Area, Pipe Size, Stack Size), Third Floor (Pipe Area, Pipe Size, Pipe Area Note mislabeling? Should it not read 'Stack Size'?)}
Back: 175° Gravity Heating Systems{Third Floor (Stack Size, Pipe Size, Pipe Area), Second Floor (Stack Size, Pipe Size, Pipe Area), First Floor (Pipe Size, Pipe Area)}, BTU [ Loss Factors 6-21, Wind Dir., Temp. Diff. ] CFM No.2, Sq Ft Hot Water Rad, Sq Ft Steam Rad
Gauge Marks: [       ]
Condition: C2-C3 (very minimal signs of use but without instructions)
Came with: Original cardboard box, work sheets

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