The Principia logo depicts the legendary apple of Sir Isaac Newton. One story
relates that Sir Isaac discovered gravity by an apple falling on his head. While this
story is not historically accurate, it is a common myth - and would have undoubtedly caused
problems with his coiffure. A more plausible story is that he sat under an apple tree and
observed an apple hanging from the tree with the moon behind it in the
distance. He then came to the realization that the earth's gravitational pull
was acting on both the apple and the moon, which later led to the famous
Universal Theory of Gravitation.
The motto on the logo is the general transport equation. This equation is also known as the general conservation law equation or the Navier-Stokes equation. The form shown in the logo is shorthand for
With appropriate substitutions this equation describes the conservation of mass, momentum, energy, moisture and turbulence.
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Page updated on Mon Aug 2 11:38:40 MDT 2004
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