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Dorothy Brengel helps W.D. Foden, Chairman of Statler Safety Committee, demonstrate the “Drunkometer”, a breath tests for alcohol, on display at the Greater New York Safety Council, Hotel Statler, March 28, 1950. For the preliminary test, the breath of the suspect is collected in a balloon and passed through a purple fluid (potassium permanganate and sulphuric acid) to see if it changes color. The breath of a non-drinking person will cause no change. If the purple color disappears, the amount of breath required to accomplish this indicates the approximate accumulation of alcohol in the blood. (Photo by Carl Nesensohn/AP Photo)
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