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An Eaton M62 Roots-type supercharger is visible at the front of this Ecotec LSJ engine in a 2006 Saturn Ion Red Line.. The Roots-type blower is simple and widely used. It can be more effective than alternative superchargers at developing positive intake manifold pressure (i.e., above atmospheric pressure) at low engine speeds, making it a popular choice for passenger automobile applications.
It was founded in 1854 by the inventors Philander Higley Roots and Francis Marion Roots. It is notable for the Roots blower, a type of pump. [1] Today, Roots blowers are mainly used as air pumps in superchargers for internal combustion engines; they were first used in blast furnaces to blow combustion air to melt iron. [2]
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A lobe pump, or rotary lobe pump, is a type of positive displacement pump. It is similar to a gear pump except the lobes are designed to almost meet, rather than touch and turn each other. An early example of a lobe pump is the Roots Blower , patented in 1860 [ 1 ] to blow combustion air to melt iron in blast furnaces, but now more commonly ...
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Climbers sometimes carried only two cylinders each. Four cylinders contained a total of 960 litres of oxygen, which would last for eight hours at the standard rate of 2 litres per minute or seven hours at 2.2 L/min. [32] The attempt on Everest by George Mallory and Andrew Irvine in 1924 was the first summit attempt using oxygen on Everest. [31]
The Next Whole Earth Catalog (ISBN 0-394-70776-1) in 1980 was well received, and an updated second edition followed in 1981. The 1980s also saw two editions of the Whole Earth Software Catalog, a compendium for which Doubleday had bid $1.4 million for the trade paperback rights. [7]
This list consists of people who reached the summit of Mount Everest more than once. By 2013, 6,871 summits have been recorded by 4,042 people. [1] [2] By the end of 2016 there were 7,646 summits by 4,469 people. [3]