Skip to main content

Dr. Leon Greenberg (1907-1985)  is most famous for his invention of the Alcometer in 1941, a machine that analyzed the breath for alcohol, pictured here.

His device allowed iodine vapour, starch and potassium iodide to react with the breath of a subject and change color depending on the level of alcohol present. Nearly thirty years later, Greenberg also invented the Alco-Calculator, a slide-rule device that indicates what the blood alcohol level would be if certain amounts of alcohol were consumed over varying periods.