C-Thru PS-79

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C-Thru PS-79 Proportional Scale

PS-79
PS-79
  • Type: Circular
  • Size: 8 Inches / 20 cm
  • Material: Plastic
  • Scales: (slide rule equivalents)
    • Front: Reduction size (A) / Size of original (B) (denoted in inches)
    • Window: Percentage of original size (B), Number of times of reduction (BI)

Obtained in early 2005 from the art supplies section of the University of Washington Bookstore. With point-of-sale card. Intended for graphic artists to quickly calculate size reductions and maintain proportions. Tell them they're using a slide rule as intended. Go ahead. See if they believe you.

Retrieved from "http://sliderule.mraiow.com/wiki/C-Thru_PS-79"
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