On This Date In History

On July 27, 1949, the world’s first jet-propelled airliner, the British De Havilland Comet, makes its maiden test-flight in England. The jet engine would ultimately revolutionize the airline industry, shrinking air travel time in half by enabling planes to climb faster and fly higher.
The Comet was the creation of English aircraft designer and aviation pioneer Sir Geoffrey de Havilland (1882-1965). De Havilland started out designing motorcycles and buses, but after seeing Wilbur Wright demonstrate an airplane in 1908, he decided to build one of his own. The Wright brothers had made their famous first flight at Kitty Hawk, North Carolina, in 1903. De Havilland successfully designed and piloted his first plane in 1910 and went on to work for English aircraft manufacturers before starting his own company in 1920. De Havilland Aircraft Company became a leader in the aviation industry, known for developing lighter engines and faster, more streamlined planes.
In 1939, an experimental jet-powered plane debuted in Germany. During World War II, Germany was the first country to use jet fighters. De Havilland also designed fighter planes during the war years. He was knighted for his contributions to aviation in 1944.
Following the war, De Havilland turned his focus to commercial jets, developing the Comet and the Ghost jet engine. After its July 1949 test flight, the Comet underwent three more years of testing and training flights. Then, on May 2, 1952, the British Overseas Aircraft Corporation (BOAC) began the world’s first commercial jet service with the 44-seat Comet 1A, flying paying passengers from London to Johannesburg. The Comet was capable of traveling 480 miles per hour, a record speed at the time. However, the initial commercial service was short-lived, and due to a series of fatal crashes in 1953 and 1954, the entire fleet was grounded. Investigators eventually determined that the planes had experienced metal fatigue resulting from the need to repeatedly pressurize and depressurize. Four years later, De Havilland debuted an improved and recertified Comet, but in the meantime, American airline manufacturers Boeing and Douglas had each introduced faster, more efficient jets of their own and become the dominant forces in the industry. By the early 1980s, most Comets used by commercial airlines had been taken out of service.

On July 27, 1921, at the University of Toronto, Canadian scientists Frederick Banting and Charles Best successfully isolate insulin, a hormone they believe could prevent diabetes, for the first time. Within a year, the first human sufferers of diabetes were receiving insulin treatments, and countless lives were saved from what was previously regarded as a fatal disease.
Diabetes has been recognized as a distinct medical condition for more than 3,000 years, but its exact cause was a mystery until the 20th century. By the early 1920s, many researchers strongly suspected that diabetes was caused by a malfunction in the digestive system related to the pancreas gland, a small organ that sits near the liver. At that time, the only way to treat the fatal disease was through a diet low in carbohydrates and sugar and high in fat and protein. Instead of dying shortly after diagnosis, this diet allowed diabetics to live, for about a year.
A breakthrough came at the University of Toronto in the summer of 1921, when Canadians Frederick Banting and Charles Best successfully isolated insulin from canine test subjects, produced diabetic symptoms in the animals, and then began a program of insulin injections that returned the dogs to normalcy. On November 14, the discovery was announced to the world.
Two months later, with the support of J.J.R. MacLeod of the University of Toronto, the two scientists began preparations for an insulin treatment of a human subject. Enlisting the aid of biochemist J.B. Collip, they were able to extract a reasonably pure formula of insulin from the pancreases of cattle from slaughterhouses. On January 23, 1921, they began treating 14-year-old Leonard Thompson with insulin injections. The diabetic teenager improved dramatically, and the University of Toronto immediately gave pharmaceutical companies license to produce insulin, free of royalties. By 1923, insulin had become widely available, and Banting and Macleod were awarded the Nobel Prize in medicine. (Banting felt the Nobel should have been shared with Best and shared his share of the prize money with Best.)

 

 

On July 27, 1953, after three years of a bloody and frustrating war, the United States, the People’s Republic of China, North Korea, and South Korea agree to an armistice, bringing the fighting of the Korean War to an end. The armistice ended America’s first experiment with the Cold War concept of “limited war.”
The Korean War began on June 25, 1950, when communist North Korea invaded South Korea. Almost immediately, the United States secured a resolution from the United Nations calling for the military defense of South Korea against the North Korean aggression. In a matter of days, U.S. land, air, and sea forces had joined the battle. The U.S. intervention turned the tide of the war, and soon the U.S. and South Korean forces were pushing into North Korea and toward that nation’s border with China. In November and December 1951, hundreds of thousands of troops from the People’s Republic of China began heavy assaults against the American and South Korea forces. The war eventually bogged down into a battle of attrition. 
In the U.S. presidential election of 1952, Republican candidate Dwight D. Eisenhower strongly criticized President Harry S. Truman’s handling of the war. After his victory, Eisenhower adhered to his promise to “go to Korea.” His trip convinced him that something new was needed to break the diplomatic logjam at the peace talks that had begun in July 1951. Eisenhower began to publicly hint that the United States might make use of its nuclear arsenal to break the military stalemate in Korea. He allowed the Nationalist Chinese government on Taiwan to begin harassing air raids on mainland China. The president also put pressure on his South Korean ally to drop some of its demands in order to speed the peace process.
Whether or not Eisenhower’s threats of nuclear attacks helped, by July 1953 all sides involved in the conflict were ready to sign an agreement ending the bloodshed. The armistice, signed on July 27, established a committee of representatives from neutral countries to decide the fate of the thousands of prisoners of war on both sides. It was eventually decided that the POWs could choose their own fate, stay where they were or return to their homelands. A new border between North and South Korea was drawn, which gave South Korea some additional territory and demilitarized the zone between the two nations. The war cost the lives of millions of Koreans and Chinese, as well as over 50,000 Americans. It had been a frustrating war for Americans, who were used to forcing the unconditional surrender of their enemies. Many also could not understand why the United States had not expanded the war into China or used its nuclear arsenal, however, such actions would likely have prompted World War III.