The nursery rhyme Ring around the Rosie came about during the time of the Black Death. Here are what the lyrics mean: Ring around the rosie is a reference to the black sores that would appear on your body as part of the plague. Your rosie is around the center of the back of your hand. A pocket full of posies is a reference to people would carrying posies (flowers) around to not smell the sickening scent of dead bodies everywhere.
What is Vibration Reduction and how does it work? Camera shake (unintentional movement of a camera during an exposure) is probably the most common cause of pictures being spoilt by a lack of sharpness. Nikon's Vibration Reduction (VR) system helps to reduce the effects of camera shake. It is important to draw the distinction between subject movement and camera movement (camera shake).
To prevent this vibration, a harmonic balancer is attached to the front part of the crankshaft. The damper is composed of two elements: a mass and an energy dissipating element. The mass resists the acceleration of the vibration and the energy dissipating (rubber/clutch/fluid) element absorbs the vibrations.ertain cars, however, do not come equipped with an external balancer on the crank pulley, and as such, can have the pulley replaced with a performance oriented product which counter-acts these resonance frequencies.