A surprising fact is that such a necessary tool in wartime, such as a can opener for opening tin cans, was created almost 50 years after the release of these canned goods.
The reason for the appearance of a can opener
In 1795, before the march of Napoleon to Europe withits conquest before the French government faced the task of finding a rational way to preserve products for a long time. For a decent offer was promised a reward of 12,000 francs. The prize went to the chef Francois Apper, who proved that the finished product, such as roasted meat in a sealed container and boiled in water, can be kept closed for at least a year. As a container they were offered glass jars. And in 1809 they began to produce the first products in the form of conservation.
Из-за хрупкости стеклянные банки через год replaced with tin containers. The patent for the use of tin was obtained by the Englishman Peter Durand. Although there were iron cans more reliable, but due to the tin thickness of 5 mm they weighed more than the product contained in them. In addition, it was necessary to make a lot of effort to open canned food. A hammer and a chisel were necessary for the opening.
The invention of a knife for opening canned food
48 years before the contents of canned food traveled by allwith improvised means, until the idea of creating a product with which one could easily open a tin canning lid, came to Ezra Warner. The patented can opener had two blades, one had to pierce the can, and the other to rest the knife on its side. The invention, as well as canned food, gained popularity only during the years of the Civil War, when soldiers were given food in a canned form, and a Warner knife was attached to it.
In the future, there was widespread interest in creatingproducts more simple and easy to use. J. Oterhud in 1866 received a patent for a tin can, on the lid of which there was a key. With each turn, its cover twisted, more and more opening access to the content.
Can opener with a wheel was invented in 1878year by William Lyman. The knife resembled a drawing compass, having a knife in the form of a wheel on one part. The principle of opening banks is also similar to the work of compasses. One pointed leg stuck into the center of a round lid, and along its circumference another leg with a wheel moved, which opened the can.
In 1921, the Lyman can opener was a bitimproved. On the outer side of it, where the cutting wheel was located, a guide gear was installed. The rim of canned food was located between the wheels, which did not allow the knife to slide off.
Modern can openers
In 1942, the Chicago laboratory, which investigatedprovision of life, was invented the easiest to use can opener R-38. In order to open the tin can, it was necessary to press and raise the key 38 times, while developing tremendous pressure on the lid. The key was stamped literally in seconds and consisted of two folding parts. Attached a knife to the army ration. After using the can opener should be rinsed in boiling water to get rid of the residual contents of the can.
Later, electric knives were invented, revealing canned food in seconds. Moreover, the bank is held between the knife and gear and does not fall.
Opening technique
To date, the most affordable openerfor tin cans it has a metal or wood handle and an iron plate with two horns of different sizes. With its help, you can open not only canned food, but also beer bottles, pies, canned meat and grandmothers marinades. The process is not complicated, and yet there are those who are wondering how to use a can opener. The first step is to install a long horn at the edge of the can and strike with the hand, applying force, on the handle, punching through the tin. The horn should plunge into the jar, then you need to move the knife around the circumference, swinging it up and down, but not pulling it out.
To open a bottle of beer, you should place the edge of the lid between the horns, and place a long one on top, and pull the knife up, while slightly pressing the opener on the bottle lid.
Care of can openers
Can opener canprovoke food poisoning. If not to wash it, numerous remains of food from various products accumulate on an edge. You can imagine how poisonous the dirty tool is. Taken scrapings from can openers on the study showed the presence of various pathogens and infections. To avoid infection, it is necessary every time after opening the banks wash the blade with boiling water. Cleaning a can opener is easy. You can wash your hands or put it in the dishwasher. The old dirt is well cleaned with a brush for teeth.
