Bead and reel

The term string of pearls (composed of pearl and cord) called in different areas, a geometric figure, in which linear elements with round ( spherical, pearl-like ) elements alternate ( - oooo ).

Architecture

If strings of beads as a frieze or as a decorative motif on, they shall be referred to as beading, frieze with oval instead of round shapes as egg and dart. This is an already well-known in classical antiquity and again aufgegriffenes ornament.

Curtains made of pearl beads

Today, under strings of pearls also be understood as curtains that can be hung as a visual and mosquito protection in door or window openings and are composed of numerous individual filaments with attached small balls.

Pearls on a string as a graphic element

In transport is referred to in a grid plan, the graphical representation of a traffic line ( linear element ) with their stops ( beads) as a string of pearls.

Perlschnureffekt

Solar eclipse

Among a string of pearls or the Perlschnureffekt visible during a total eclipse of the sun or parts of the corona are called. Individual bright points are visible on a circular bright line of the sun's surface.

Optoelectronics

LEDs are often operated with pulsed direct current to control its brightness. Unlike incandescent lamps, an LED is fast enough to actually go, even at high frequencies on and off. Depending on the frequency of the flicker is seen more or less clearly.

The Perlschnureffekt called a fake perception, caused by the inertia of the human eye. When looking at a pulsed -powered LED in the dark, which moves relative to the observer, the LED appears more than once in a path. This makes, for example, in many modern cars taillights disturbing.