Spitzglass Flow Calculator

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Country of manufacture: USA,            Date of manufacture: ____
Overall length: 27.7 cm,          Width: 5.8 cm,           Weight: 227.7 gms (including leather wallet)
Materials: all plastic
Cursor: 4.0 X 6.1 X 0.4 cm; all plastic wrap-around containing spring tensioner, front side only;        Lines: one
Scales: A, B, C, D, plus specialized
Front: Drop in Pounds/Feet/Inches (A) [ Gas or Air: Length in miles or 100 Feet (B), Mean Gauge Pressure in Pounds ] [ Gas or Air: Specific Gravity, Pipe Diameters, C ] Discharge in Cu Feet/Pounds/Gallons (D)
Back: Attached to leather wallet
Slide 1 Back: Steam or Water: Length in 100 Ft (B), Mean Gauge Pressure in Lbs
Slide 2 Back: Steam or Water: Log, Pipe Diameters, C
Gauge Marks: [ π, 785 ]
Condition: C8 (leather wallet holding rule and directions badly deteriorated); rule itself about C5 (normal use)
Came with: nothing

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Directions stitched into upper third of wallet:
      

Slide 1 Back side:

Slide 2 Back Side:

Insert stitched into lower third of wallet:

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