Galileo Galilei the use of the compasses for 120 lire. In about 1593, Galileo constructed a thermometer, using the expansion and contraction of air in a bulb to move water in an attached tube. In 1609, Galileo was, along with Englishman Thomas Harriot and others, among the first to use a refracting telescope as an instrument to observe stars, planets or moons. The name "telescope" was coined for Galileo's instrument by a Greek mathematician, Giovanni Demisiani, at a banquet held in 1611 by Prince Federico Cesi to make Galileo a member of his Accademia dei Lincei. The name was derived from the
Giacomo Badoer Giacomo Badoer Giacomo Badoer (c.1575 – c.1620) was a French-born diplomat, of Venetian parentage, and pupil of Galileo Galilei. Badoer studied mathematics with Galileo in Padua in 1598/9. He later supported Galileo in 1607, in a priority dispute with Baldassarre Capra over the invention of a military compass. Badoer was one of the correspondents of Paolo Sarpi in Venice, who towards the end of 1608 was making enquiries about the invention in the Netherlands of the telescope. Badoer wrote back in Spring 1609 from Paris to Sarpi with news of the commercial telescopes then being sold; it is said that