The possible origin of the donuts

Doughnuts have a disputed history. One theory suggests they were invented in North America by Dutch settlers, and in the 19th century, doughnuts were sometimes referred to as one kind of oliekoek (a Dutch word literally meaning "oil cake"), a "sweetened cake fried in fat."
Hanson Gregory, an American, claimed to have invented the ring-shaped doughnut in 1847 aboard a lime-trading ship when he was 16 years old. Gregory was dissatisfied with the greasiness of doughnuts twisted into various shapes and with the raw center of regular doughnuts. He claimed to have punched a hole in the center of dough with the ship's tin pepper box, and to have later taught the technique to his mother. Smithsonian Magazine states that his mother, Elizabeth Gregory, "made a wicked deep-fried dough that cleverly used her son's spice cargo of nutmeg and cinnamon, along with lemon rind," and "put hazelnuts or walnuts in the center, where the dough might not cook through", and called the food 'doughnuts'.
According to anthropologist Paul R. Mullins, the first cookbook mentioning doughnuts was an 1803 English volume which included doughnuts in an appendix of American recipes. By the mid-19th century, the doughnut looked and tasted like today's doughnut, and was viewed as a thoroughly American food.
Another theory on their origin came to light in 2013, appearing to predate all previous claims, when a recipe for "dow nuts" was found in a book of recipes and domestic tips written in 1800 by the wife of Baron Thomas Dimsdale, the recipe being given to the dowager Baroness by an acquaintance who transcribed for her the cooking instructions of a local delicacy, the "Hertfordshire nut".
Now, dounts is very popular all over the world, in instury, dounts produced by Commercial Doughnut Making Machine. This machine use two means to power the passing and turning of donuts. The passing and turning of donuts is powered by alternating current, and the AC can come from two ways, one is by linking plug to socket, the other is by converting the direct current generated by battery-group to alternating current.
Saving much labor costs. Just connect this machine with power supply and get the ingredients mixed, it will make donuts automatically. There is no need to let anyone to operate, saving much labor costs.
Beautiful and wonderful performance. The high-profile appearance makes you more decent.
Multifunctional usage. You can adjust donuts size by adjusting quantity of raw materials. If more, donuts is bigger, if less, donuts smaller.