Who does not know the canned food? In modern times, as now, can become a widely used material in the market for processed food packaging. Cans own patented since 1810 by an inventor named Peter Durand of England, based on experiments of a citizen of France, Nicolas Appert.
But who thought that it took about 48 years to find specific tools that can open the packaging of tin-plated of thin iron material. Tools that later became known as a can opener, patented in England around the year 1855 and 1858 in the United States by Ezra Warner.
Nevertheless, as reported by inventors.about.com, perfecting the tool is still being done by an inventor from the United States, William Lyman. He created the opener in the form of a knife-headed slab that serves cutting edge of tin, which was then patented in 1870.
Due considered more practical, Lyman discovery is what eventually evolved and is still widely used today. His other patents were dedicated to improvements to various household food utensils such as a refrigerating pitcher (1858), fruit can lids (1862), tea and coffee pots, and a butter-dish. As an example illustrating the nature of those improvements, Lyman's fruit can lid relied on the physical principle that hot food placed in a jar and then allowed to cool would suck down the lid, provided with an elastic rim inside, thereby sealing the can.
Then, the tool is used by humans to open cans for 48-year period? The answer is a knife and a club. It is not practical right? *** [AK | ENOTES.COM | PIKIRAN RAKYAT 22122011]
