Calculate the number 840
NUMBERMANIA: Calculate the number 840 using numbers [8, 6, 8, 5, 99, 164] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.Correct answers: 2
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Early electricity from windIn 1892,“Electricity From Wind” was reported in the Cincinnati Enquirer, from the Philadelphia Record. Is said that“Owing to the comparative scarcity of water-power in many parts of England” to generate electricty, “attention has been given to wind power, of which the country is well supplied. A small experimental plant has been in operation at a flour-mill near London, the wind-mill supplying sufficient power to charge a storage battery, from which a number of arc and incandescent lamps were lighted nightly. Although the current obtained was small,” the experiment demonstrated the possibilities. The article suggested the use of wind-powered electricity generators at country houses on elevated ground. The article represents one example, not necessarily the first. Edison's incandescent lamp dates from 1879. Steam-powered central generating began in New York City in 1882.« |