Abacus for the reduction of English measures to the metric system and vice versa

Tenani, Mario
naca-tm-30
July 1921


This report presents a description of the abacus as well as construction details. There is also a detailed description on how to use the abacus.

An Adobe Acrobat (PDF) file of the entire report:
http://naca.central.cranfield.ac.uk/reports/1921/naca-tm-30.pdf