A principal direction can be one of the following:
- Principal directions - In differential geometry, one of the directions of principal curvature.
- Principal directions - a term used in gear nomenclature.
- In stress analysis, a set of axes where the normal stress vector is maximized. See Stress (mechanics)
Famous quotes containing the words principal and/or direction:
“Today, only a fool would offer herself as the singular role model for the Good Mother. Most of us know not to tempt the fates. The moment I felt sure I had everything under control would invariably be the moment right before the principal called to report that one of my sons had just driven somebody’s motorcycle through the high school gymnasium.”
—Mary Kay Blakely (20th century)
“From cradle to grave this problem of running order through chaos, direction through space, discipline through freedom, unity through multiplicity, has always been, and must always be, the task of education, as it is the moral of religion, philosophy, science, art, politics and economy; but a boy’s will is his life, and he dies when it is broken, as the colt dies in harness, taking a new nature in becoming tame.”
—Henry Brooks Adams (1838–1918)