Invention[ edit ] The first lawn mower was invented by Edwin Budding in  in Thruppjust outside Stroudin GloucestershireEngland.
June 6, For several decades now all petrol-driven motor vehicles have had to feature a catalytic converter in their exhaust systems to meet the requirements of emissions legislation.
These feature a high surface area coated with platinum, palladium, and rhodium, which catalyses the high-temperature breakdown of the exhaust gasses. When a vehicle reaches the end of its life its catalytic converter is recycled and those metals are recovered, but this recovery does not account for all the metal.
Some of that metal has escaped, so where has it gone?
The answer to that question is that it has become detached from the converter and blown out through the rear of the exhaust pipe. Therefore in the area around a busy highway with many thousands of cars passing there must be a reasonable concentration of platinum.
The resulting bags contain a lot of gravel and bits of tire, plus a few cigarette butts and a large amount of very fine dust. He sieves away the debris, and heats a sample of dust in a furnace with a flux mixture containing lead oxide.
He hopes that as this oxide degrades to metallic lead it will dissolve any platinum and settle in the bottom of his crucible, and indeed when he pours out the resulting slag there is a bead of lead. He finally arrives at a figure of 6.
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An auxiliary power unit (APU) is a device on a vehicle that provides energy for functions other than regardbouddhiste.com are commonly found on large aircraft and naval ships as well as some large land vehicles.
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