Question

 When was the first lie detector invented?

Answer The polygraph, was invented in 1921 by John A. Larson. Larson was also the person who named the machine a "polygraph." This, the first lie detector machine, measured both respiration and blood pres... Read More »
http://www.answerbag.com/q_view/1902048

Top Q&A For: When was the first lie detector invented

Who invented the first smoke detector?

The first home smoke detectors were made by Stanley Peterson and Duane Pearsall in 1965. The units used batteries, making it easy for homeowners to install and replace them. Peterson and Pearsall's... Read More »
http://www.answerbag.com/q_view/2054434

When was the smoke detector invented?

Francis Upton invented the first smoke detector in 1890. Walter Jaeger accidentally invented another smoke detector in 1930 while he was trying to make a poisonous gas sensor. Duane Pearsall and St... Read More »
http://www.answerbag.com/q_view/2028955

When was the first lie detector made?

The first modern lie detector was fashioned in 1921 by John Larson, a forensic scientist working for the Berkeley Police Department. Known as a polygraph, it recorded a person's blood pressure, pul... Read More »
http://www.answerbag.com/q_view/1793280

What does it mean when first alert smoke detector beeps 3 times?

According to a First Alert user's manual, three beeps or chirps indicate a possible malfunction in the unit that requires immediate replacement. These beeps are often accompanied by simultaneous LE... Read More »
http://www.answerbag.com/q_view/2258406


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