Galileo built many of his own instruments including the telescopes for which he is famous (but he did not invent the telescope), he was the first to describe in print what he saw in the sky.
in his lab
at his lab in 1593.
Galileo I am not so sure he was the first, but he is the most famous.
telescope
Hissele
ham
No. The magnetic compass was in use centuries before Galileo's time.
after he made it
A telescope.
Galileo Galilei.
Galileo Galilee (February 15, 1564 - January 8, 1642)
Galileo