Compound lever sudden movement of the key. The earliest remaining writings regarding levers date from the 3rd century BC and were provided by Archimedes. ""Give me a place to stand, and I shall move the earth with a lever"" is a remark attributed to Archimedes, who formally stated the correct mathematical principle of levers (quoted by Pappus of Alexandria). The idea of the compound lever is attributed to the Birmingham inventor John Wyatt in 1743, when he designed a weighing machine that used four compound levers to transfer a load from a weighing platform to a central lever from which the weight
The Prince Who Wanted to See the World The Prince Who Wanted to See the World The Prince Who Wanted to See the World is a Portuguese fairy tale. Andrew Lang included it in "The Violet Fairy Book". A king's only son wanted to see the world and was so persistent that his father let him go. He played cards with a stranger and lost all his money; then the stranger offered to give it back on another game, but if the prince lost, he would have stay at the inn for three years and then be his servant for three years. The prince agreed and lost. After