The origin of washing machine
As early as 1858, American hamilton smith invented the first washing machine in the world. At that time, the washing machine was not so advanced. At that time, the washing machine was actually a round wooden barrel with a straight shaft and paddles in it. The crankshaft connected to it was shaken by hand to wash clothes. Subsequently, wooden hand washing machines, hydraulic washing machines and internal combustion engine washing machines also appeared one after another. However, these washing machines are not accepted by the public because they are laborious to use and will damage clothes.
What really makes people know something about the washing machine is the electric washing machine made in Chicago by American Fisher in 19 1 1. This electric washing machine is powered by a small generator, just put clothes and soap in it to wash, which is more exquisite and practical, and it is also the prototype of modern washing machine. At present, the most common washing machines on the market are stirring type, pulsator type and drum type.
The origin of television
Although electronic products such as mobile phones and computers have covered the functions of TV, TV is still one of the necessary household appliances in everyone's home. 1925, British scientist John Logie Baird made the first TV prototype with a lot of waste. It is understood that the optical equipment of the first TV prototype is the lenses of some bicycle lights, and its frame is an enamel pot, while the wires are a messy cobweb-like thing that is temporarily pieced together. It is such a pile of junk that miraculously produces images.
Subsequently, the invention of television advanced by leaps and bounds! The world's first black-and-white TV set was born in the United States on 1939. Later, US President franklin roosevelt delivered a speech at the opening ceremony of the new york World Expo in Flushing Square, new york, and millions of people watched the speech live on TV! As well as the presidential debate between Kennedy and Nixon, it was also the first time to move to TV, and Kennedy, who finally won, was also called the TV president! In 1950s, color TV sets became popular and became ordinary TV sets.
The origin of refrigerator
Jacob Perkins, an American worker working in Britain, found a strange liquid one day in 1834. At that time, he didn't know what kind of liquid it was, so he made a machine with his workmates to realize the working effect of this liquid evaporation refrigeration. Interestingly, on the night when the machine was made, it produced some ice crystals. This machine is regarded as the prototype of the refrigerator.
Then, a printer named Harrison set up a production workshop in Victoria, and the first real refrigerators came out. Of course, back to the origin of refrigerators, as early as the Tang Dynasty in China, there was ice-making technology. Because at that time, electricity had not been discovered. By chance, when making an alchemist's medicine, the pharmacist found that saltpeter would react chemically when it meets water, absorbing a lot of heat energy and making the water quickly condense into ice.
Because saltpeter was not a rare resource at that time, people were able to exploit saltpeter in large quantities, so China had a refrigerator from the Tang Dynasty, which was called an ice guide at that time. Our refrigerator could store fruits and vegetables. At that time, the allusion that "the world of mortals laughed when riding a princess, and no one knew it was litchi" was that Yang Guifei loved litchi. At that time, it was this ancient ice-making technology that was used to store lychees, so that Yang Guifei could also eat iced lychees in hot summer days and win a smile from the beauty.
The origin of air conditioning
We can put on more clothes in cold weather, but there is really nothing we can do in hot summer. Although people have mastered the technology related to refrigeration for a long time, it is still difficult to accurately grasp the temperature, so smart people invented air conditioning. On July 1902 and July 17, willis carrier, who was born in a small town near Lake Erie in new york, calculated the accurate temperature and humidity required for printing according to the national climate table, and installed his own designed equipment for the printing plant, which achieved good results.
19 15, carrier and six friends raised $32,000 to set up carrier company, which is dedicated to developing air-conditioning related technologies. Until 1922, Carrier successfully developed an iconic product-centrifugal air conditioner. At that time, during World War II, the economies of various countries were depressed. After the end of World War II, the global economy began to develop rapidly. Subsequently, air conditioning began to spread slowly and entered thousands of households.
The origin of sweeping robot
Perhaps most families are still used to sweeping the floor with brooms, and the understanding of sweeping robots is still in the literal sense, but in fact, sweeping robots have also experienced hundreds of years of development. 1898, John Surman St. Louis Lu Smith of the United States submitted a patent on carpet vacuum cleaner (US 634042), but at that time, due to design defects, this technology could not completely remove dust.
By 190 1, an Englishman Booth improved the vacuum cleaner. The main parts of the improved vacuum cleaner are vacuum pump, dust bag, hose and nozzles with different shapes. Through the high-speed operation of the electric exhaust fan, an instantaneous vacuum is formed in the vacuum cleaner, so that stolen goods are sucked into the inner cylinder of the vacuum cleaner. The first sweeper in the world is a sweeping robot named "Trilobite" made by Swedish home appliance giant Electrolux in 1996. It can clean the room by itself. With the popularization of modern intelligence, today's sweeping robots are very intelligent.