Rao bulletin 1 February 2017 html edition this bulletin contains the following articles pg Article Subject
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Tide-predicting Machine The tide-predicting machine was a little bigger than many of these other inventions, but in terms of the size to impact ratio, it fits in well with little inventions. Tide-predicting machines were essentially complex analog calculators. These had been in use for some time, having been first developed in the 1870s, and were treated as classified technology by the time of the second World War. 
The US No.2 Tide Predicting Machine, called “Old Brass Brains” was essential to Allied operations in World War II. “Old Brass Brains” relied on a system of gears, pulleys and chains to complete the complex equations necessary to predict the tides at specific locations. This machine predicted the tides for all island landings in the Pacific, as well as for the essential landing in Normandy on D-Day. The landings in Normandy provide the best example of the importance of the tide-predicting machine; however, US No. 2 Tide Predicting Machine remained in use until it was replaced by a computer in 1965. German Field Marshall Erwin Rommel expected Allied forces to storm Normandy at high tide. In preparation for the attack, he installed barriers of wood, cement and steel, designed to stop ships and landing parties from reaching the shores of Normandy. The Allies would have to plan to land at low tide, destroy the barriers to open channels inland, and get ships off the beach before becoming stranded. This made the timing of the landing essential. In addition, the ships had to be able to cross the English Channel at night, have enough daylight for a naval assault prior to the landing, and needed a late-rising moon to allow paratroopers to drop into Normandy overnight the previous night. Only three dates in June met all of these requirements, according to the tide-predicting machine; June 5, 6 and 7. The carefully planned assault helped to turn the tide of war, forcing the Germans to fight on two fronts. By the end of June 1944, more than a million troops had landed in Normandy and Victory Europe Day or VE Day was less than a year away. DDT In wartime, often one of the biggest sources of casualties and deaths is not the enemy, but nature. Illness, particularly the types of illness carried by insects and pests, can decimate armies. The military was concerned about typhus, which had caused some 2.5 million military and civilian deaths in World War I, as well as mosquito-borne illnesses, like malaria and yellow fever. By the late 1930s, scientists were actively looking for an insecticide that could be used on clothing and blankets to prevent insect activity from lice and mosquitos. In 1939, Swiss chemist Paul Muller realized that a chemical compound discovered in the 19th century, dichlorodiphenyltrichloroethane, or DDT was an effective way to mothproof wool fabrics. Researchers in the U.S. soon realized that DDT worked well as an insecticide at low doses. 
U.S. soldiers were issued DDT powder, and entire towns and islands were sprayed with DDT. The use of DDT dramatically reduced soldier’s deaths from pest-related illnesses, and World War II may be the first conflict in which more individuals died from combat injuries than illness. Questions about the safety of DDT appeared early on in its history, but it was not banned in the United States until 1972. As early as 1946, scientists recognized that the chemical could concentrate in fatty tissues, and serious criticisms were published in the 1962 book, Silent Spring. While DDT led to ongoing health and environmental issues, it also inaugurated an era of chemical solutions in the world of agriculture. The market success of DDT led to the development of a wide range of other pesticides, used extensively for a number of decades. [Source: http://historycollection.co/category/war | Michelle Powell-Smith | January 14, 201 ++] ************************* Directory: wp-content -> uploads -> 2017 2017 -> Leadership ohio 2017 -> Ascension Lutheran Church Counter’s Schedule January to December 2017 2017 -> Board of directors juanita Gibbons-Delaney, mha, rn president 390 Stone Castle Pass Atlanta, ga 30331 2017 -> Military History Anniversaries 16 thru 31 January Events in History over the next 15 day period that had U. S. military involvement or impacted in some way on U. S military operations or American interests 2017 -> The Or Shalom Cemetery Community Teaching on related issues of Integral 2017 -> Ford onthult samenwerking met Amazon Alexa en introduceert nieuwe navigatiemogelijkheden van Ford sync® 3 met Applink 2017 -> Start Learn and Increase gk. Question (1) Name the term used for talking on internet with the help of text messege? 2017 -> Press release from 24. 03. 2017 From a Charleston Car to a Mafia Sedan 2017 -> Tage Participants 2017 -> Citi Chicago Debate Championship Varsity and jv previews Download 7 Mb. Share with your friends:
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