when was the first motorized lawn mower invented
Lawn mower Manufacture of lawn mowers took off in the 1860s. By 1862, Ferrabee's company was making eight models in various roller sizes. He manufactured over 5000 machines until production ceased in 1863. The first grass boxes were flat trays but took their present shape in the 1860s. James Sumner of Lancashire patented the first steam-powered lawn mower in 1893. His machine burned petrol and/or paraffin (kerosene) as fuel. These were heavy machines that took several hours to warm up to operating pressure.[6] After numerous advances, these machines were sold by the Stott Fertilizer and Insecticide Company of Manchester and Sumner. The company they both controlled was called the Leyland Steam Motor Company.
Rolls-Royce Limited From 1940, Rolls-Royce participated in the development of the jet engine and built for itself, and retains, a pre-eminent position in aero engine development and manufacture for use in defence and civil aircraft.
Noise pollution Up until the 1970s governments tended to view noise as a "nuisance" rather than an environmental problem.
Paris Peace Accords
Ferris wheel The original Ferris Wheel, sometimes also referred to as the Chicago Wheel,[8][9][10] was designed and constructed by George Washington Gale Ferris Jr..[11]
Bifocals In 1955, Irving Rips of Younger Optics created the first seamless or "invisible" bifocal, a precursor to all progressive lenses.[2]