At last he impatiently remarked, "Does nobody know that Dx ⁄ dt means velocity?"
"I felt an immediate overload of power in my Dx circuit," the servo-pilot confessed.
The simplest possible case is, therefore, that in which ds is the square root of a quadratic function of the Dx.
The writer considers as very doubtful the formula for Dx, which is the same as that for W1, already discussed.