1883 was the year Joseph Mortimer Granville the “father of the modern elctromechanical vibrator” wrote a book about it.
These early vibrators became popular among the medical profession and were used for treating a wide variety of ailments in women and men, including hysteria, arthritis, constipation, amenorrhea, inflammations, and tumors; some wounded World War I soldiers received vibrotherapy as treatment at English and French hospitals in Serbia.
1883 was the year Joseph Mortimer Granville the “father of the modern elctromechanical vibrator” wrote a book about it.
https://en.wikipedia.org/wiki/Vibrator_(sex_toy)
Ancient China had vibrators at least as early as the Ming Dynasty. IIRC it was a reaction between gold and mercury that would make the ball shake.