A rolling ruler is a ruler that contains a cylinder much like a rolling pin inside, thereby enabling it to "roll" along a sheet of paper or other surface where it is being used. A rolling ruler can draw straight, parallel lines, and also has other instruments included, enabling it to do the jobs of a protractor and compass.
Famous quotes containing the words rolling and/or ruler:
“The child is innocence and forgetting, a new beginning, a game, a wheel rolling on its own, a prime movement, a sacred Yes.”
—Friedrich Nietzsche (1844–1900)
“Know yourself and fit yourself to new fashions. For there is a new ruler among the gods.”
—Aeschylus (525–456 B.C.)