Posted 6 years ago
This is a "Datalizer" English / Metric Conversions Data Slide-Chart - it was used to calculate conversions of English length, area, mass, and volume to metric amounts. Miscellaneous conversions on the back such as acres, bushels, nautical miles, long and short tons etc. - Same concept and use as a slide-rule but for industrial "in-the-field" on sight calculations.
Was used in the chemical catalyst industry (food additives and hygiene products)
- - - - ©1976 Datalizer Slide Charts, Inc., Addison, Illinois
- - - - Form #EM2 / Made in the U.S.A.