Prior to the 1920s, women used to blow-dry their hair by inserting a flexible pipe in the exhaust of a vacuum cleaner. In 1920, the first hair dryer was invented. Though the machine was not efficient enough and got overheated easily, it was, of course, better than using a vacuum cleaner!
Technology, science, inventions, and re-inventions have progressed at an accelerated rate during the hundred years of the 20th century, arguably more so than any other century. We began the 20th century with the infancy of airplanes, automobiles, and radio, which dazzled us with their novelty a...
More complete information about other devices is found in the writings of Heron of Alexandria (flourished 1st century ce), who described devices actuated by water, falling weights, and steam. Accounts of automatons in China date from as early as the 3rd century bce, during the Han dynasty, ...
Dr Shirley Ann Jackson contributed to these two inventions; during, her research period at Bell Laboratories in the 1970s. The Modern Central Heating System In the 1920s, Alice H. Parker’s model used natural gas to heat a home instead of wood and allowed multiple rooms to be heated at...
had written to theSmithsonian Institutionfor suggestions as to further reading in aeronautics. The following year they wrote to introduce themselves toOctave Chanute, a leadingcivil engineerand an authority onaviationwho would remain aconfidantof the brothers during the critical years from 1900 to ...
A.Many bees die of hunger during the cold winter.B.Honey produced by bees tastes good but unhealthy.C.Bees will perhaps be killed after they produce honey.D.Bee farmers don’t want to spend money feeding them.【4】What can Purrble help us withA.The sense of touch.B.The sense of ...
Transformation of transport and cities was highly witnessed, and significant technological advancements increased the textile industry. The following are some of the machines invented during the Industrial Revolution: Spinning jenny Steam engine James Watt's steam engine Cotton gin Telephone Spinning Jenny...
properly. Let’s wait and see.be used will be put be chosen will be handed will be paid will be dealt 一二二、 单项填空( C )1. If you use the mobile phone while driving, you bythe police.A. are catching B. will catchC. will be caught D. caught( C )2. The party will at ...
Pasteur’s vaccine was suitable for animals. Human vaccines for anthrax weren’t made until the 1920s. Photographic Film George Eastman – 1885 The first photographic films were layered with paper, which would be peeled off during the development of the image. Transparent, plastic films were firs...
During the 1950s, Margaret’s husband started to sell her paintings as if they were his own without asking for her permission. She confronted her husband when she discovered what he was doing, which led to him intimidating, threatening, and emotionally abusing her to silence her. However...