This is Galileo’s argument from “The Assayer,” which I encountered in both my history survey of modern philosophy and in metaphysics. Galileo. Galileo Galilei; Il Saggiatore (The Assayer); Rome, This quietly polemical text puts the case for a pared-down scientific conception of matter and a. Il saggiatore (The assayer) by Galileo Galilei (–) is the final and most significant work in the polemic regarding the characteristics of.

Author: Mazugor Maulrajas
Country: Mayotte
Language: English (Spanish)
Genre: Love
Published (Last): 3 June 2009
Pages: 209
PDF File Size: 16.68 Mb
ePub File Size: 18.58 Mb
ISBN: 192-2-86446-570-7
Downloads: 68990
Price: Free* [*Free Regsitration Required]
Uploader: Tygoll

Let neither Sarsi nor others imagine me to be weighing every word when I deal with him more freely than he may like.

Passing then to two, and knowing as before that a glass with parallel faces alters nothing, I concluded that the effect would still not be achieved by combining such a glass with either of the other two.

Upon hearing this news I returned to Padua, where I then resided, and set myself to thinking about the problem. In assayed early days of the telescope he had experimented with such an application of it, but it was only when writing The Assayer that he altered the lens system and produced a manageable compound microscope.

Create a free wssayer or blog at WordPress.

Galileo’s The Assayer | Here She Be — The Battlements

Grassi had referred to the views which Kepler ler had set forth in an early optical work, and Galileo rightfully objected to the implication that these views were similar to his own. Many materials are such that in their decomposition the greater part of them passes over into additional tiny corpuscles, and this dissolution continues so long as these continue to meet with further matter capable of being so resolved. Now withdraw to a greater distance and climb some hill or other prominence in order to see the water better; the lighted field will now appear to be one and continuous.

When Sarsi heated his bit of copper by pounding it many times, I can well believe that he detected no diminution in its weight even by the most delicate balance. In Sarsi I seem to discern the firm belief that in philosophizing one must support oneself upon the opinion of some celebrated author, as if our minds ought to remain completely sterile and barren unless wedded to the reasoning of some other person. It is my affair to print my ideas for the world to read, Sarsi, not yours.

Of bodies that are rubbed together, some are certainly not consumed, others are quite perceptibly consumed, and still others are indeed consumed, but insensibly.

Those who neglect mathematics wander endlessly in a dark aassayer. The former may strike upon a certain part of our bodies that is much more sensitive than the skin, which does not feel the invasion of such subtle matter. I used to remove the difficulty by showing that such a phenomenon was far from improbable, and indeed would be in accordance with Nature and practically forced to occur.


Kepler has always been known to me as a man no less frank and honest than intelligent and learned. For if you assayeg observe what happens in breaking glass or stones, you will see some perceptible fumes emerge and rise high in the air, which must be lighter than air.

Before I proceed let me tell Sarsi that it is not I who [p. This theory of his, I think, is no more inherently true than the statements of these same philosophers when they attribute the rumbling of thunder to the tearing apart of clouds, or aasayer their knocking together. I replied to them that I had only some questions to raise, which I was unable to write down because of my infirmity, but that I hoped these ideas of mine would soon be included in a discourse by a friend who had taken the trouble to collect them.


This is the upper surface of the tongue; here the tiny particles are received, and mixing with and aseayer its moisture, they give rise to tastes, which are sweet or unsavory according to the various shapes, numbers, and speeds of the particles.

By reasoning about these they may easily discover, to their great honor and profit, how to construct such things.

The Assayer

That usually happens only with the words of great and celebrated men, which really far exceeds the bounds of my ambition. Sarsi has seen it proved in my Starry Messenger that the earth itself shines more brightly than the moon.

It is Sarsi who has taken it into his head to write against Guiducci’s treatise, and in the process he has been forced to grasp at skyhooks. Now we do not lack eggs, nor slings, nor sturdy fellows to whirl them; yet our eggs do not cook, but merely cool down faster if they happen to be hot.

First of all, galoleo is quite false that I said in my Starry Messenger that Jupiter and Saturn have little or no irradiation, while Mars and Venus and Mercury are grandly crowned with rays. The first night after my return I solved it, and on the following day I constructed the instrument and sent word of this to those same friends at Venice with whom I had discussed the matter the previous day. Your Excellency may, if you like, show them to him some time so that he may by replying establish his position more solidly.

And why should I speak of the comet as shining like a planet? Mathematics, on the other hand, is symbolized by telescopes, and an astrolabe.

Galileo, Selections from The Assayer

Next Sarsi patches together an argument out of various fragments of propositions designed to prove that the comet assayerr situated between the moon and the sun. So is the ellipse, which originates from the cutting of a cone or a cylinder.


When touched upon the soles of the feet, for example, or under the knee or armpit, it feels in addition to the common sensation of touch a sensation on which we have. Thus Sarsi may see that insensible reductions of weight do valileo from consumption over a period of months on end, let galilso the few minutes he may have persisted in hammering away at his bit of copper.

Hence I was restricted to discovering what galkleo be done by a combination of the convex and the [p. What he said was, to be exact, “If the telescope does not render stars visible by enlarging them, then by some unheard-of means it must illuminate them. Why has he considered me the author of this Discourse without showing any respect for that fine man who was?

Works of Galileo Galilei, Part 3, Volume 15, Astronomy: The Assayer

Still, since I like to see mysterious things brought to light, and since I wish to discover the truth, I shall consider his argument; and for a assaywr understanding let me first reduce it to as few words as possible. Next, you see, Sarsi represents me as being finally convinced by the force of his logic and snatching at some very slender straw by saying that if it is true the fixed stars fail to receive enlargement as do nearby objects, then at any rate this is because the same instrument is not used, as the telescope must be a longer one for very close objects.

Those who know very little galileoo philosophy are numerous. Our senses show us that those which are not consumed at all by rubbing, such as two polished mirrors, are not heated by rubbing, either. Immediately afterward I applied myself to the construction of another and better one, which six days later I took to Venice, where it was seen with great admiration by nearly all the principal gentlemen men of that republic for more than a month on end, to my considerable fatigue. Hence they reasoned about it as about the other planets, to the effect that the closer Of these to the sun are the more irradiated and consequently are less enlarged when observed through the telescope.

We merely said that the proofs thus far set forth by other authors are not free from objections. It is certainly true that to the person holding the bowl such a ball appears to move with respect to himself and to the bowl, and to turn upon its axis. The image will promptly be dimmed too. We know that those are heated which are perceptibly consumed, as iron when it is being filed.

Let Sarsi see from this assayet superficial his philosophizing is, except in appearance.