Steam digester Torricelli and further developed by German scientist Otto von Guericke with his Magdeburg hemispheres. Guerike's demonstration was documented by Gaspar Schott, in a book that was read by Robert Boyle. Boyle and his assistant Robert Hooke improved Guericke's air pump design and built their own. From this, through various experiments, they formulated what is called Boyle's law, which states that the volume of a body of an ideal gas is inversely proportional to its pressure. Soon the ideal gas law was formulated. Based on these concepts in 1679 a Boyle's associate, named Denis Papin, built a "bone digester", which is
The miller who was a wizard, a cheat and a matchmaker The miller who was a wizard, a cheat and a matchmaker The miller who was a wizard, a cheat and a matchmaker (title in Russian "Мельник – колдун, обманщик и сват [Melnik – koldun, obmanshchik i svat]") – is a Russian ballad opera in three acts with a libretto by Alexander Ablesimov that premiered on . Its folksong-based music was long attributed to Yevstigney Fomin but is now considered to have been by Mikhail Sokolovsky, and others have contributed music to revivals. The music for the opera is nowadays agreed to be by Mikhail Sokolovsky, although for a century it