Galileo Galilei's Work

7.  1593 : Thermometer
 1597 : Compass
 1609 : Telescope
 1641 : Pendulum Clock

8. • People need a way to tell the temperature outside
or inside
• Galileo was taking medical school at university of
Pisa. His 1st invention was the thermometer
• He construct the thermometer, which used the
expansion and contraction of gas inside aglass bulb
to move water in an attached tube

9.  Invented and improve a Geometric and Military
Compass
 In 1597, he built a compass used for aiming
cannonballs
 It was also adapted for civilian use in land surveying

10.  Though Galileo didn’t (Dutch opticians did),
he improved upon it
 The 1st telescope used a combination of two
lenses within a tube, and it could magnify
items by three times, but showed them
upside down
 But when Galileo constructed his own
telescope in 1609, he added a third lens.
His telescope magnified items by 8 times
and showed them right side up
 Galileo built several telescopes, including
one that would magnify item by a factor of
30

11.  Another invention that Galileo worked on was a
pendulum clock
 Galileo discovered isochronism - that the time it takes for
the pendulum to swing is not linked to the arc of the
pendulum
 He also created a design for a pendulum clock in 1641, but
never completed one before death

12.  Galileo discovered four of Jupiter’s largest moon: lo,
Europa , Calisto , and Ganymede
 In september of 1610, Galileo observed that Venus,
like the moon, exhibited a full set of phases
 This helped prove that the universe was heliocentric
and not geocentric
 Galileo was the 1st to discover that the Moon was
rough and uneven

16.  Galileo observed the Milky Way and found it to be
stars that were packed together densely
 Galileo located many stars that were too far from
Earth to be visible with naked eye alone
 In 1612, Galileo observed Neptune without realizing
it was a planet he considered it to be just another
dim star
 Galileo was the 1st to observe the sunspots

18.  Galileo worked on the motion of bodies in sky
 Galileo proved that time of descent was independent
of the mass of the object
 Galileo was one of the 1st people to understand how
sound frequency worked
 In 1632, Galileo presented a theory which explained
the tides , based on the motion of the Earth
 In 1638, Galileo described an experimental method
to measure the speed of light

20.  https://en.wikipedia.org/wiki/Galileo_Galilei
 https://www.nndb.com
 www.galilieo.rice.edu