versione italianaGALILEO GALILEI

galileo-1.jpg (7192 byte)Galileo Galilei was born in Pisa in 1564, he was one of the most important personalities in the field of science.
Son of Vincenzo, known musician, Galileo inherited from him the love for music and his indipendent character. His family included by him, other seven brothers, the father and the mother, G. Ammannati, a "terrible" woman as he called her.

When he was 17 years old he was sent for his father's will to the university of Pisa to study medicine. Here Galileo noticed the separation existing between the world of that time and the reality. For this motive he abandoned university, to devote himself completely to his studies and to his scientific experiments.

For many years Galileo could study and do his experiments without meeting problems, but in 1616 he was admonished by the cardinal Bellarmino,who forbided him to diffuse and to write about the "Copernican theory".

According to the Copernican  theory the sun didn't turn around the world (as it was written in the Bible), but the world turned around the sun. Surely this affirmation wouldn't have been a help to the church, that saw it's power in the trust of people.

Galileo silented for 16 years, until he convinced Pope Urbano VIII to publish the book "Dialogue on the two maximuns systems" (Ptolemaic system and Copernican system), with his Copernican theory.

When the church realized it, it reacted immediately: it forbided the diffusion of "Dialogue...", and put Galileo in prison charged with heresy. Under torture Galileo had to yield, and he was forced to renounce to his theories (abyuration); he was condamned to isolation and he spent this period first in Siena, later at Arcetri (Firenze).

During his imprisonment, Galileo could write a book entitled "Speech about two new sciences", this book marked the start of the "mechanics".

On 31st of October 1992 with a very symbolic gesture, the Vatican deleted the sentence inflicted by   St. Uffizio on 22nd June 1633.

Since Galileo often observed the sun with the telescope, his eyes, suffered so such that he became blind.

He died on 8th January 1642 A.D.

Galileo was a great scientist. He was fond of art and music. Albert Einstein in person stated that Galileo's use of the scientific reasoning  was the greatest event of the history of human thought.

He was the first scientist to impede the thougts of the "scholasticism".
In fact he stated it
wasn't God to reveale the truth to the people in order that they could apply it, but they were people themselves to discover the phenomenos and to invent the machines thanks to their intelligence.

He inserted the experimental method, that consisted in trying one's own theories before returning them to the public.
In practice, you had to confirm your theories by an experiment; if the experiment was negative it meant that the theory was wrong.

 In his long career Galileo invented many instruments still useful in ours days:

galile-1.gif (3819 byte)THE HYDROSTATICS BALANCE
In his studies Galileo proved that if you immerse an object into a full pail of water, the object moves the same quantity to his volume.
He discovered also that a thing in the water weighed less than into the air.
So he constructed a balance that weighed the things into the water and the things in the air.                                    This invention was called "hydrostatics balance".

galile-2.gif (2994 byte)THE THERMOMETER BY AIR
This thermometer was composed by a very thin tube in glass, open to one extreme, while on the other extreme it was found a hollow bulb.
The open extremity of the tube was immersed in a basin full of water, while a candle warmed the bulb.
The air into the bulb dilated because it was warm.When it dilated it occupied more clearance, so it pushed the water. The pushed water into the basin lifted up the level.
This instrument allowed to show the quantity of heat present in the air.

Telesc.jpg (8446 byte)THE TELESCOPE
The first prototype of the telescope was built in 1608 by the optic Lippershey Giovanni. This prototype arrived in Italy in 1609. 
We don't know if Galileo could observe it, but it's sure that after some time he realized an other "up-to-date" prototype.
He brought it to Venezia to show it to his friends.
Lately he gave this instrument to the rule of Venezia.
Galileo used the telescope to study the sky-blues corps (planets, stars, etc...). In particular he noticed the resemblance between the Moon and the Earth.

THE PENDULUM
One day Galileo was in the cathedral of Pisa and he was curios about the fluctuation of the chandelier.
Through his intelligence and his love for music he noticed that the fluctuations always employed the same time.
So he decided to study a machine to calculate the time using the fluctuations.
So he invented the pendulum clock.

translation of Claudia Dall'Ora, Sara Guardini, Sara Sartori, Giulia Zantedeschi. - 3a.99/00
teachers: Chiara Mendini, Franco Erbesato
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