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For normal use the machine is set to start picking up a concentration of carbon monoxide at a point where it starts to enter the blood stream — .01 per cent, or one part of carbon monoxide to ten thousand parts of air. The United States Bureau of Mines says that twenty parts of carbon monoxide in that amount of air will bring unconsciousness, and knock you out for good provided you whiff it for thirty minutes or longer.
Darby has not only developed a great life-saver against carbon mou' oxide gas poisoning — there is also the possibility that his machine will be the world's greatest fire alarm. Since most fires are preceded by a concentration of carbon monoxide prior to the blaze, there is an even chance that the Darby machine will alarm before the fire starts. At least it will warn when it breaks into a blaze, thus giving time to locate and fight the fire before it is out of control.
Carbon monoxide gas takes a hideous toll of lives every year. It can strike without warning, lulling its victims into unsuspecting sleep from which there is often no awakening; or it may cause partial sleep during which the victim — perhaps driving a car, piloting an airplane or handling a powerful diesel locomotive — is fully conscious, unaware of his drowsiness but as unable to control his reflexes as if he were intoxicated.
WILLIAM C. DARBY was born in St. Paul, Minnesota, moving as a youngster with his family to Minot, North Dakota, where he attended school. In high school Bill was a football star but before graduating he enlisted in World War I. Later he
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returned to get his diploma and to continue his education at the University of Minnesota, specializing in electrical engineering.
Bill returned to North Dakota where he married Evelyn Nichols, a school teacher. They have four sons, Kelly, Duane, Donald and Larry. Three served in World War II and the youngest expects to enter service as soon as he receives his college degree. All four attended college, taking such subjects as electronics, chemistry and electrical engineering. The Darby household is a bee hive of technical terms and problems when the four engineer-minded sons start a bull session with their dad. Ideas arose in these sessions to play an important part in the Darby invention. Kelly, the oldest son, has worked with his dad for several years at the laboratory.
Life hasn't been easy for Bill and Evelyn Darby. Bill's own life was in constant peril from his experiments