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The Crookes radiometer (also known as a light mill) consists of an airtight glass bulb containing a partial vacuum, with a set of vanes which are mounted on a spindle inside. The vanes rotate when exposed to light, with faster rotation for more intense light, providing a quantitative measurement of electromagnetic radiation intensity.
It was first used in electrostatics experiments, and later in high-voltage equipment such as spark-gap radio transmitters and electrotherapy machines. Originally, the amount of capacitance was measured in number of ' jars ' of a given size, or through the total coated area, assuming reasonably standard thickness and composition of the glass.
Note that incandescent light bulbs from flashlights are not used because the lemon battery is not designed to produce enough electric current to light them. Such a battery typically produces 0.001 A (1 mA) of current at a potential difference of 0.7 V; these values are multiplied together to determine the overall power of 0.0007 W (0.7 mW).
Franklin called this device an "electrical battery", [4] but that term later came to have a different meaning, referring instead to a set of one or more galvanic cells. At that time, the word "battery" was a military term for a group of cannons. [32] Franklin was the first to apply the terms "positive" and "negative" to electricity.
Morrison-Electricar was a British manufacturer of milk floats and other battery electric road vehicles (BERV). Their first vehicle was built for a bakery in 1933, and the company ceased to exist when it was finally sold to M & M Electric Vehicles of Atherstone in 1983. The latter company was dissolved following liquidation in 2014.
Sir Joseph Wilson Swan FRS (31 October 1828 – 27 May 1914) was an English physicist, chemist, and inventor.He is known as an independent early developer of a successful incandescent light bulb, and is the person responsible for developing and supplying the first incandescent lights used to illuminate homes and public buildings, including the Savoy Theatre, London, in 1881.
Lewis Latimer (1848–1928), U.S. – improved carbon-filament light bulb Gustav de Laval (1845–1913), Sweden – invented the milk separator and the milking machine Semyon Lavochkin (1900–1960), Russia – La -series aircraft, first operational surface-to-air missile S-25 Berkut
Edison's method was to invent systems rather than components of systems. Edison did not just invent a light bulb, he invented an economically viable system of lighting including its generators, cables, metering and so on. Edison invented by repeatedly trying devices in more complex environments to progressively approximate their final use ...
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