These movable weak permanent magnets are usually mounted on the back end of the deflection yoke assembly and are set at the factory to compensate for any static purity and convergence errors that are intrinsic to the unadjusted tube. The majority of storage tubes allow for a lower voltage to be applied to the storage mesh which slowly restores the initial charge state. Convergence and purity are distinct parameters; a CRT could have good purity but poor convergence, or vice versa. The shadow mask ensures that one beam will only hit spots of certain colors of phosphors, but minute variations in physical alignment of the internal parts among individual CRTs will cause variations in the exact alignment of the beams through the shadow mask, allowing some electrons from, for example, the red beam to hit, say, blue phosphors, unless some individual compensation is made for the variance among individual tubes. The brightness, color, and persistence of the illumination depends upon the type of phosphor used on the CRT screen. It is then possible for the image to be retained for several days. Watch stunning HD porn movies with skinny moms and cougar whores putting huge young dicks in their pussies and asses. An internal graticule eliminates parallax error , but cannot be changed to accommodate different types of measurements. Galore of skinny Latina girlfriends can't wait to get your attention as well. Fap on cute as hell Latina spinners that easily handle giant dicks with their lil cunts. Like convergence, there is static purity and dynamic purity, with the same meanings of "static" and "dynamic" as for convergence. Phosphor persistence[ edit ] Various phosphors are available depending upon the needs of the measurement or display application.













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