The Works of Galileo

Galileo's Later Years

Two New Sciences

Under house arrest, Galileo turned his attention to a number of topics that had long interested him. This is his masterwork of physics, the Discourse on Two new sciences (Figure 1) . These two sciences concern tensile strength and motion. The elegant treatise on motion is the classic statement of modern kinematics. The title page stubbornly announces that Galileo was still a Lynx, and still a philosopher or physicist as well as a mathematician. It was published in Leiden. Galileo couldn’t publish anything in Italy.

Two new sciences is also written in the form of a Platonic dialogue, with the same disputants as the work of 1632. But there is nothing of cosmology in this, the last book of Galileo’s to be published in his lifetime. This is a work on motion, including the parabolic motion of projectiles. (Figure 2) (Figure 3) .

Figure 1 Figure 1 - Return to Text

Discorsi (1638), title page.

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Figure 2 Figure 2 - Return to Text

Discorsi (1638), p. 239.

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Figure 3 Figure 3 - Return to Text

Discorsi (1638), p. 240.

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Exhibit credit: Kerry Magruder, with the assistance of , Marilyn B. Ogilvie, Duane H. D. Roller.

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