ETYM Old Eng. cranke; akin to Eng. cringe, cringle, crinkle, and to crank, a., the root meaning, probably, See Cringe.
Handle bent at right angles and connected to the shaft of a machine; it is used to transmit motion or convert reciprocating (back-and-forward or up-and-down) movement into rotary movement, or vice versa.
Although similar devices may have been employed in antiquity and as early as the 1st century in China and the 8th century in Europe, the earliest recorded use of a crank in a water-raising machine is by Arab mathematician al-Jazari in the 12th century. Not until the 15th century, however, did the crank become fully assimilated into developing European technology.—
Rotating shaft with parallel handle; SYN. starter.
eccentricity / eksəntrɪsəti /
Množina reči eccentricity je eccentricities.
ETYM Cf. French excentricité.
1. Strange and unconventional behavior.
2. A circularity that has a different center or deviates from a circular path.
3. (Geometry) A ratio describing the shape of a conic section; the ratio of the distance between the foci to the length of the major axis.
In geometry, a property of a conic section (circle, ellipse, parabola, or hyperbola). It is the distance of any point on the curve from a fixed point (the focus) divided by the distance of that point from a fixed line (the directrix). A circle has an eccentricity of zero; for an ellipse it is less than one; for a parabola it is equal to one; and for a hyperbola it is greater than one.