The German engineer and master builder—Johann Helfrich Müller (1746-1830) (see biography of Johann Müller) is a very interesting figure in the world of mechanic calculators, not only for his small calculator, an improved version of the machine of Philipp Hahn, which he created, but for his plans to build a difference engine almost 40 years before Charles Babbage.
Johann Müller was a creative mind and started to make inventions from the beginning of 1770s. First he created a theatre, equipped with optical and mechanical effects for the children of the Prince, later on he designed a large and powerful burning mirror, as well as other devices.
"Since time immemorial, man has glanced up at the sky and watched with great envy as those magnificent winged creatures above flew circles around him. And although we now have airplanes, deep down inside, we still secretly want to experience what it’s like to soar like an eagle (as cliche as that sounds).
Well, I’m here to tell you that man’s day has come. That’s because on Sunday a Dutch inventor by the name of Jarno Smeets did the unthinkable when he strapped on a pair of homemade wings and flapped toward the heavens, officially becoming the first man in history to fly like a bird with self-built wings, as reported by Wired.com."