Keuffel and Esser N4053-5

From Wiki

Jump to: navigation, search

Keuffel and Esser Model N4053-5 "Polyphase"

Obverse
Obverse
Reverse
Reverse
  • Type: Closed Body Enhanced Mannheim
  • Size: 20 Inches / 50 cm
  • Material: Mahogany and celluloid
  • Scales:
    • Front: A [ B CI C ] D K
    • Back: [ S L T ]
  • HvH: 4134

Inch and centimeter scales on body. Black paperboard box in poor condition. Unit conversions and materials properties on reverse. Hairline missing on reverse. Serial Number 59907 impressed on body and slide.

20 inches. 200 divisions between 1 and 2. 100 divisions per unit from 2 through 5. 20-inch rules were made for the serious engineer who needed 3 significant figures day in and day out. People built bridges with these. As were most Mannheim rules, this is a desktop unit rather than a handheld.

Manufactured around 1925, based on serial number and cursor style

Retrieved from "http://sliderule.mraiow.com/wiki/Keuffel_and_Esser_N4053-5"
Personal tools