A History of Mechanics
Dover Publications, 1988 - 662 стор.
"A remarkable work which will remain a document of the first rank for the historian of mechanics." -- Louis de Broglie
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This law makes it possible to formulate the condition of equilibrium of a straight
lever with two unequal arms which carry unequal weights at their ends. Indeed,
when the lever rotates the velocities of the weights will be proportional to the ...
In Descartes' work on the lever, the resistance is always a weight hung from the
lever, and the power is constantly perpendicular to the arm of the lever. Guido
Ubaldo had made use of this practical observation and Descartes followed him.
The straight lines h and h' are considered as the arms on an angular lever with
axis d. The straight line h" is considered as a straight lever with axis 6 (in the
plane perpendicular to q' drawn through q). If p is displaced along p' (by dp) the
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