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There are also a number of different types of vibrators used in the construction industry to settle and compact soil. Another type of vibrator can be used to drive foundation piles into the ground. Used in emptying a hopper containing granular material such as corn or grain. The vibrations of the vibrator reduces friction during discharge and helps maintain a reliable flow of material. Small printing firms will use vibrator tables to square-up a pile of pages after they have been printed. In the aerospace and military electronics industries, engineers often test electronic circuit cards both individually and in their equipment boxes whilst mounted on a flat vibrating table. The table is driven from a large motor similar to a moving-coil loudspeaker. The frequency of vibration can be random, or specific frequencies can be used to detect and permit the assessment of resonances. As the mechanism for a conveyor belt. Basically the belt jerks down and then back whilst not in contact with the objects being moved. Then the belt rises to recontact the object and moves forward, advancing the object. This technique is most commonly used with small particles. A similar technique can be used to achieve a vertical conveyor system using a multitude of tiny suitably-shaped buckets. In pagers and mobile telephones, a vibrator is mechanical device that produces vibratory motion to notice a call, see vibrating alert. The electrically-powered vibrator was invented in the 1880s by doctors, who had been ostensibly treating women for "hysteria" for centuries by performing what we would now recognise as masturbating those women to orgasm.[1] At the time, however, not only did doctors regard the "vulvular stimulation" required as having nothing to do with sex, they reportedly found it time-consuming and hard work. The vibrator got the job done more quickly and without such efforts, and as such was extremely popular with doctors. Home versions began to appear soon after and became equally popular, with adverts in places like Needlecraft, Woman's Home Companion, Modern Priscilla and the Sears, Roebuck catalog. These disappeared in the 1920s, apparently because their appearance in pornography made it no longer tenable for polite society to avoid the sexual connotations of the devices. In their more common guise as "body massagers", millions of vibrators have been sold to both men and women. Some of the purchasers never use their purchases for anything other than relief from muscular tension or aches and pains. However, many people who purchase vibrators marketed as "body massagers" — and, presumably, most people who purchase vibrators marketed as adult toys — use them to attain sexual release, primarily in masturbation, a form of autoeroticism. 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