What made one of the world's first vibrators for sexual stimulation vibrate?

Explanation

A dildo is a sex toy, shaped like a penis and used for sexual stimulation. A vibrator can be shaped either like a dildo, or something completely different, such as a butterfly for clitoris stimulation. Dildos made out of stone have been found in archaeological excavations and have probably existed in one form or another throughout most of our history. The Egyptian Queen Cleopatra VII is said to have owned one of the world's first vibrators: a small container filled with bees. In 1880 Dr Joseph Mortimer Granville patented the first electro-mechanical vibrator.